Animal health

Stopping Flies in 2026: 4 Steps to Battling These Economic Pests

Wed, 06 May 2026 14:27:47 GMT

With fly season approaching, now is the time to evaluate and refine your fly management plan for 2026.

“Every year, stable and horn flies cause significant economic losses, but a good fly control program can minimize this impact,” says Cassandra Olds, Kansas State University Extension entomologist. “Although often grouped together, these are very different flies that need different control approaches.”

Dr. Ashby Green, Neogen senior technical services veterinarian, says, “If you are seeing flies, ticks, lice or insect damage to your cattle herd, we know there is an economic impact; however, that impact can become far greater than production or weight gain loss alone. Insect pressure affects grazing patterns of cattle; it affects their comfort and it can lead to health issues. Some of those health issues can be definite, such as anaplasmosis.”

The vectors responsible for spreading anaplasmosis include horse flies, stable flies and ticks. This condition has been reported in most states across the U.S., while the disease has been recognized as endemic throughout the South and several Midwestern and Western states.

Jonathan Cammack, Oklahoma State University assistant professor and state extension specialist, says, “With horn flies, we’re looking at mastitis risk, so that’s going to impact both dairy cattle and also our cow-calf operations. A lot of times, horn flies will feed on the udders of the animals, and they transfer the Staphylococcus aureus bacteria because they land on the manure, then they go back to the animal to feed and bring those bacteria with them.”

Several other conditions are propagated by flies, including pinkeye, which can be spread by face flies and causes inflammation and ulceration of the eyes. Pinkeye-affected calves are, on average, 35 lb. to 40 lb. lighter at weaning compared to healthy calves, according to a University of Kentucky report.

Cammack predicts flies are costing the U.S. cattle industry $6 billion annually in losses.

“That encompasses everything from actual loss in production due to decreased weight gain or decreased milk production, veterinary needs associated with treatment of cattle with exposure to pathogens from some of these insects, and then also the control measures associated with managing those individual fly species,” he explains.

David Boxler, Nebraska Extension livestock entomologist, says if previous control efforts underperformed, consider adjusting your approach.
“The best control method will depend on several factors including efficacy, cost, convenience and your current herd management practices,” he summarizes.

He also reminds producers that horn flies can migrate from neighboring untreated herds, masking the effectiveness of your efforts and increasing fly pressure. For this reason, Boxler recommends a comprehensive, integrated fly control.

Olds shares these tips for stopping flies, or at least reducing their impact:

Step 1: Know What You Have

“The first step in developing a good fly control program is knowing who you have,” Olds explains.

(Kansas State University)

Horn flies feed 20 to 30 times a day and stay associated with their chosen animal 24/7, with females only leaving briefly to lay eggs. Stable flies in contrast only feed once or twice a day, remaining on the host for a short period of time (3 to 5 minutes).

When not feeding, flies are resting in shaded areas such as building sides and vegetation. This short feeding time means producers often underestimate their stable fly burdens. While both flies affect pastured cattle, horn flies are not a problem in confined settings such as dairies and feedlots. This is because horn flies need fresh, undisturbed manure as a breeding site while stable flies can develop in any decaying plant matter such as hay bales, feed bunk spill over and decaying grass.

“Their populations can build rapidly and often exceed the economic injury level defined as 200 flies per animal,” Boxler adds about horn flies. “Once fly numbers surpass this threshold, cattle experience reduced weight gain and milk production due to fly-induced stress and altered grazing behavior.”

Step 2: Reduce Populations

Olds explains with either fly species, using non-insecticidal control methods is essential for slowing insecticide resistance. For horn flies, pasture burning in spring kills any flies overwintering, which can significantly reduce fly populations emerging as weather warms. A healthy dung beetle population will also significantly reduce your fly numbers for free.

“Dung beetles are very susceptible to macrocyclic lactones so avoid using injectable and pour-on avermectins (abamectin, eprinomectin, ivermectin etc.),” Olds says.
Because horn flies die within hours of being removed from cattle, non-chemical walk-through traps can be effective if animals pass through it regularly.

Step 3: Eliminate Breeding Grounds

Round hay bales result in significant wastage, which when mixed into the manure-contaminated mud around bales provides a prime breeding site for stable flies.
Olds explains each round bale can produce 200,000 stable flies.

“Reducing hay waste and spreading/drying areas around finished bales is key to reducing stable fly numbers,” she says. “In feedlots, minimizing feed spillage and waste is critical to remove breeding sites for stable and house flies.”

Parasitoid wasps are available from multiple sellers and should be released around fly breeding sites. These are very effective if released before fly populations emerge and released repeatedly through the fly season.

Be careful using insecticides if using parasitoid wasps as they are very small and sensitive to these chemicals. Keeping vegetation surrounding pen areas short and exposed will remove sheltered resting areas, making life more difficult for the flies.

Step 4: Consider Chemical Control Options

Olds stresses chemical control options should be used as a supplement not the basis of a fly control program.

(Kansas State University)

“For horn flies, insecticidal ear tags are an effective method of control if correct rotation is used,” she adds. “Rotate the chemical class of your tag annually, in year one using pyrethroid-based products, year two use organophosphate-based products and year three use macrocyclic lactone tags. Repeating this three-year cycle will reduce the selection pressure on the fly populations, slowing down the spread of resistance.”

Olds also shares these tips for effective tagging: “Tag both ears and place the tag directly into the ear. For the tag to be effective, it must come into direct contact with the animal’s skin, which is greatly reduced when daisy chained.”

Little of the tag touches the body when attached to another tag.

(Cassandra Olds, Kansas State University)

She also instructs producers not to tag young calves and adds mature bulls with thick necks might not benefit from tagging unless the tag can touch the skin.

“Although the box may label products as effective for four to five months, field trials have shown that tags only remain effective for 90 to 100 days,” Olds says. “If possible, wait until fly populations are noticeable before tagging animals to get control over peak fly activity period. After 90 days, remove the tag to reduce the risk of insecticide resistance developing.”

(Neogen)

To increase coverage, pour-ons of the same chemical class as the ear tag can be used to increase coverage.

“Be aware that a macrocyclic lactone pour-on will impact dung beetle populations,” Olds says. “Make sure animals are dosed accurately according to weight and ensure head to tail coverage. Due to their low contact time with the host and preference for the legs, topical insecticidal treatments are generally not useful against stable flies.”

Spraying the legs can provide some relief, although it should be used sparingly as most sprays are pyrethroid-based, not allowing for effective annual rotation. Baits and premise sprays can be useful in controlling both house and stable flies, look for areas where flies are found resting such as building walls, fence posts and inside sheds and shelters.

Another option is feed through insect growth regulators (IGRs) to control horn fly. Olds says it is important cattle consume the correct amount, which can be difficult under free-choice conditions.

“Under-dosing will result in resistance developing over time, reducing product efficacy,” she says. “Although labeled for stable fly control also, when manure containing the IGR is diluted in the mud and hay, it is no longer effective.”

Often marketed as dung beetle safe, Olds says evaluations of these claims in most species have not been carried out, and their true impact remains unknown.

“Insecticide resistance to IGRs can and does happen; to slow this, rotate annually between Methoprene-based (Group 7A) and diflubenzuron-based products (Group 15),” she adds.

The Veterinary Entomology website , veterinaryentomology.org/vetpestx, provides a searchable database that can help producers select the right products. Producers can select from type of animal, insect and application method.

“For on-animal use, select the best product to allow an annual rotation between pyrethroid (Group 3A), organophosphate (Group 1B) and macrocyclic lactone (Group 6) groups,” Olds says.

Green also recommends using a multi-pronged approach to insect control. He says fly tags, IGR products, pour-ons, back rubbers and dust bags can help diminish the population.

“Both back rubbers and dust bags can be highly effective if managed correctly,” Green advises. “Keep in mind, when these are put out to withstand the elements, including moisture and rain, it’s key to keep the dust fresh or the oil recharged in your back rubbers. Otherwise, they will diminish in their ability to control flies quickly.”

Cammack stresses the importance of accurate dosing by the individual animal’s weight and following label guidelines.

To best control flies and insects on cattle operations, “the easy and effective way is the best way,” Green summarizes. “It’s up to you and with the help of your veterinarian to help create that combination.”

BQA at the Chute: 10 Tips for Spring Calf Processing

Mon, 04 May 2026 13:52:42 GMT

Spring calf processing is a critical window for establishing herd immunity, but its success depends entirely on the details. By following Beef Quality Assurance (BQA) principles, producers can maximize vaccine efficacy and protect carcass value through precise needle selection, proper injection site placement and strict adherence to the “one-hour rule” for modified-live vaccines.

“It will soon be time to process spring-born calves, which brings up the topic of best management practices and following BQA principles for all treatments,” says Chris Clark, Iowa State University Extension and outreach beef specialist, in a recent Growing Beef Newsletter. “The overall concepts are pretty simple, but it takes attention to detail to get the most out of each treatment and to ensure our product is as safe, wholesome and palatable as possible.”

Clark shares these 10 simple reminders for spring processing:

Follow label directions for all treatments, including injections, implants, pour-ons, insecticide ear tags, etc.
Administer all subcutaneous and intramuscular injections in front of the shoulder in the injection site triangle of the neck.
Select the appropriate needle diameter and length based on the weight of the animals being treated, viscosity of products being injected and routes of administration. Needles should be small enough to minimize tissue damage but large enough to prevent bending and breaking. The diameter should be appropriate for the viscosity of the product, and the length should be appropriate for the route of administration. For young calves weighing less than 300 pounds, 18-gauge needles are reasonable for most vaccines. For subcutaneous injections, ½ inch to ¾ inch needle length should work well, and for intramuscular injections, ¾ inch to 1 inch needle length should be appropriate. Keep in mind the greater the needle gauge, the smaller the diameter and vice versa.

Recommended needle size based on animal weight, viscosity of product and route of administration.
(BQA Field Guide)
Practice injection technique and pay attention to the angle of injection and the feel of the needle within the tissue. Subcutaneous injections should be applied at approximately 45 degrees to the body and intramuscular injections should be applied at approximately 90 degrees to the body. With experience, you can learn to feel whether you are in that subcutaneous space or whether you have entered the underlying muscle.
Change needles frequently. At a minimum, needles should be changed every 10 to 15 head. Additionally, a new needle should always be applied before refilling a syringe and any bent or burred needles should be immediately replaced.
For reusable syringes, clean well after each use by thoroughly rinsing with hot water. Refrain from using soaps and disinfectants because residues of these substances can damage vaccines and reduce vaccine efficacy.
Handle vaccines with care. When using modified live vaccines, mix only what you can use in an hour. Keep vaccines at steady, reasonable temperatures and take care to avoid freezing, excessive heat and exposure to UV light. Reconstitute modified live vaccines with sterile transfer needles and roll or invert gently to mix rather than shaking vigorously.
When possible, choose subcutaneous routes of administration over intramuscular routes. Some products are labeled to be given either way and when you have the choice, choose subcutaneous. Any insertion of a needle or injection of a substance into muscle tissue will cause tissue damage, potentially impacting the quality of that product.
Document complete processing/treatment records, including animal or group identification, treatment date, products administered, withdrawal times, earliest date animals would clear withdrawal times, dose administered, route of administration, name of person administering drugs and any prescription information.
Do not mix different vaccines or drugs in the same syringe or use a syringe to administer different products without washing in between. Try to place injections at least 4 inches apart from other injections to avoid product mixing/interaction within animal tissue.

Stop the Guesswork: Build a Targeted Parasite Plan

Mon, 04 May 2026 13:51:51 GMT

As grass greens up and cattle head back to pasture, many producers are “throwing darts in an open field” when it comes to parasite control, says Tennessee Hereford breeder Ryan Proffitt.

The real-world frustration of deworming programs is knowing if they are working, Proffitt says.

Norbrook Technical Services Veterinarian Megan Bollin explains fecal egg count testing, targeted treatment, concurrent deworming, maintaining refugia and smarter pasture management can turn parasite control guesswork into a targeted plan that protects herd health, preserves dewormer efficacy and ultimately adds pounds to the calf crop.

Both Bollin and Proffitt agree a pragmatic roadmap for modern parasite control is anchored in diagnostics, targeted treatment and strong relationships with veterinarians.

Bollin shares five practical strategies to get the most out of today’s dewormers and preserve them for tomorrow:

1. Sit Down with Your Vet.

She encourages producers to map out a herd‑specific internal and external parasite plan with diagnostics built in.

“Your local vet should be your key partner in designing a program that fits your parasites, climate and management style,” Bollin says.

2. Use the Right Product at the Right Time.

Use the correct class, correct dose and consider concurrent deworming when resistance is a known issue. Your local veterinarian can guide you on proper treatment timing to avoid wasting money.

3. Manage Pastures with Parasites in Mind.

Bollin says pasture management is as important as treatment. Pasture type, quality, topography and drainage should all be considered in your plan, knowing we can’t always do much to change them.

“Only about 10% of the parasite life cycle is in the animal; 90% is on pasture,” she says.

Larvae generally stay below 4” on the grass blade. She says it is important to avoid overgrazing pastures below this height and manage stocking density accordingly.

“When you get a big rain after a drought, the larvae that had been waiting in the manure pats can quickly become infective and significantly increase the risk of infection, especially in young calves,” she says.

4. Prioritize High-Risk Animals.

Calves, stockers, bulls and replacements should be prioritized with the strictest parasite control and monitoring programs.

“Calves, replacement heifers and bulls are typically heavier shedders and more susceptible to the effects of parasites than mature cows,” Bollin explains.

Proffitt notes that many producers historically concentrate on keeping mature cows dewormed while underestimating calves’ role as carriers.

“We don’t need to, and shouldn’t be, treating every animal like we always have,” Bollin adds. “That has gotten us in a pickle with resistance.”

5. Measure and Adjust Treatment.

Bollin says it is important to know where you started. Get a baseline fecal egg count, understand your resistance patterns and monitor the efficacy of your treatment program. So many variables change from year to year: climate, weather conditions, new animals and other stressors. It’s critical to routinely evaluate your deworming program and avoid blindly doing the same thing year after year.

(Proffitt Family)

Diagnostics Are Essential, Not Optional

Fecal egg count reduction tests (FECRTs) are the most practical method we have to determine if dewormers are still working and at what level.

Bollin explains the process includes:

Collecting rectal fecal samples and recording identification.
Treating animals with product or products of choice.
Resampling the same animals by taking rectal fecal samples, 10 to 17 days later, depending on the drug or drugs used.

The lab will count how many eggs per gram are in that fecal sample. There will be a pretreatment and a posttreatment sample. Bollin says the goal should be greater than 95% reduction.

Proffitt argues FECRTs are worth the hassle.

“If we don’t have a game plan on what we’re doing and we’re just rushing,” he says. “What did we win at the end of the day if we don’t know what we’re doing?”

Proffitt says testing tells him which cows he can skip treating, which saves him money.

Bollin explains in many cases mature cows 3 years and older, shedding low levels of eggs, on a good plane of nutrition, with no other stressors or health concerns (including liver flukes), should not need to be dewormed.

“This supports ‘refugia’ — intentionally leaving low-risk animals untreated to slow resistance,” she explains. “Because they’re mature, they’ve got a competent immune system that can actually fight off these parasites by themselves without a dewormer.”

To reduce costs further, Bollin says producers can pool fecal samples from multiple cows into a single submission.

(Deb Gustafson)

Beating Parasite Resistance Starts at the Chute

Bollin says dewormer resistance, long documented in sheep and goats, is being seen more frequently in U.S. cattle herds.

She says overuse, underdosing and treating every animal regardless of need are major drivers in resistance.

“All of these deworming products, when they were originally approved, had very high levels of efficacy. We’re talking 99% and above,” Bollin explains. “As we’ve continually used these products, efficacy has been challenged because resistance has increased.”

If you’re using products that are no longer effective in your herd, you’re spending money on drugs that don’t work, and you’re not getting the production benefits. One way to restore efficacy when resistance is present is to use concurrent deworming.

Why Concurrent Deworming Matters

Bollin says concurrent deworming is using two dewormers from different classes at the same time. She stresses producers need to work with a veterinarian to avoid unknowingly pairing two products from the same class, which doesn’t provide the intended benefit.

She explains the benefits of concurrent deworming are:

· Higher overall efficacy when two partially effective products are combined. “Say you’ve got two products, for example, each with 70% efficacy. By using them together, you can raise your overall efficacy to levels exceeding 90%,” she says.

· Broader spectrum of parasite coverage.

· Models would suggest a slowing of resistance.

· Only sustainable long-term when used in conjunction with a refugia program. This means we don’t treat every animal. We want to keep a few “good” worms around that are still susceptible to the drug.

Bollin gives the example of pairing a benzimidazole, or a “white dewormer,” such as fenbendazole, albendazole or oxfendazole, with a macrocyclic lactone such as ivermectin, moxidectin or eprinomectin.

She emphasizes the industry unfortunately doesn’t have a lot of studies looking at this, but a study published in 2025 highlighted the benefits of concurrent treatment with fenbendazole in situations where resistance to macrocyclic lactones is likely.

Dung Beetles Are Valuable Allies

Dung beetles break up manure pats, exposing eggs and larvae to sunshine and dry conditions. Some dewormers are more compatible with dung beetle health.

“Two of the dewormers that are not harmful are moxidectin and fenbendazole,” Bollin says. “Those are two molecules that are generally safe for dung beetles, and those could be a good option to pair together.”

Facility where researchers collect blood samples and weigh cattle before and after they are transported. Steers have painted numbers on their backs so their activity can be followed on camera.

(Stephanie Hansen)

Application Technique and Dosing Accuracy Matter

Bollin says accurate body weights, not visual estimates, are critical, explaining underdosing is a key driver of resistance.

“One of the biggest contributors to resistance is that we are just not giving them enough active ingredient,” she says. “If you don’t have scales, it is best to treat to the heaviest body weight in the group, so that you make sure that they’re all getting enough.”

She also stresses the importance of storing deworming products correctly.

“Leaving them by the chute in temperature swings can reduce efficacy,” she says.

Proffitt also reminds producers to read labels and understand rain windows with pour-ons and to avoid mud or manure on hides. Bollin notes that injectables can provide more certainty that the animal is getting the full dose, whereas oral drenches can be spit out and pour-ons can run off or be groomed off by penmates.

Both Bollin and Proffitt frame parasite control not as one more chore on an overloaded to-do list but rather as a strategic, data-driven opportunity to protect animal health, slow resistance and convert good management into pounds sold.

Your Next Read:

Determine Parasite Load and Follow With Treatment

While Waiting for the Vet: Managing Uterine and Rectal Prolapses on Farm

Wed, 29 Apr 2026 17:49:27 GMT

Finding a cow with a prolapse is the kind of situation that raises urgency immediately. You call your veterinarian, but they may be 30 to 60 minutes away. What you do during that window can influence how straightforward the case will be once they arrive.

The goal is not to fix the prolapse yourself but rather to stabilize the situation and prevent it from getting worse. Erika Nagorske, a large-animal veterinarian with 4 Star Veterinary Service, shares the following advice for producers while they wait for their vet to arrive and address a prolapse.

Control Movement First

The most important first step is containment. A prolapse becomes more difficult to manage when the animal is moving, circling or slipping. Movement increases contamination, swelling and the risk of further damage.

“Every situation’s different, but if her entire uterus is prolapsed after she’s calved, there are really big blood vessels attached to that,” Nagorske says. “If she’s running around like crazy and not confined, those blood vessels can tear.”

Keeping the animal calm and contained is the most effective way to protect both the tissue and the outcome.

Nagorske recommends, without working the animal too much, getting it in a small space or in the chute. Even a tight alley can work. The goal is to limit the animal’s ability to turn quickly or move excessively.

Good footing is also important, as slipping can worsen the situation quickly.

(Provided Photo)

Uterine Prolapse: Protect the Tissue

With a uterine prolapse, the focus is on protecting exposed tissue until the veterinarian arrives.

Keep the uterus as clean as possible and avoid unnecessary handling. If feasible, try to keep it off the ground using clean towels, plastic or bedding. Even small efforts to reduce contamination can make a difference.

Avoid repeatedly trying to reposition or push the uterus back in. That can increase irritation and swelling, making the veterinarian’s job more difficult.

Think of this stage as preservation; the less trauma and contamination, the better the chances of a smooth replacement.

Rectal Prolapse: Reduce Swelling Early

Rectal prolapses present a slightly different challenge. Swelling can increase quickly, which makes replacement more difficult over time.

“Throw table sugar on it to help it shrink up so by the time I get there, it’s not twice the size it was when you first called,” Nagorske says.

Applying granulated sugar directly to the prolapsed tissue helps draw out fluid and reduce swelling. This is a simple, safe step that can improve the likelihood of a successful correction.

As with uterine prolapses, avoid aggressive handling or repeated attempts to push the tissue back in.

What Not to Do

In both situations, a few common missteps can make things worse:

Do not let the animal roam freely.
Do not repeatedly handle or push the tissue.
Do not delay calling the veterinarian.

Stabilize, Then Step Back

The time before the veterinarian arrives is about control, not correction. Keeping the animal contained, protecting exposed tissue and taking simple, targeted steps can make a significant difference in how the case progresses.

A calm, controlled approach sets the veterinarian up for success and gives the animal the best chance for a positive outcome.

“Report, Don’t Hide It”: Experts Urge Rapid Action When Suspecting New World Screwworm

Tue, 28 Apr 2026 21:14:04 GMT

As New World screwworm edges closer to the U.S., industry leaders urge producers to shift from worry to action.

Early detection, prompt reporting and treatment — backed by coordinated surveillance along the border — will be critical to keeping this treatable pest contained. Ranches are tightening calving seasons , upgrading working facilities and revisiting parasite control plans with their veterinarians. The core message to the fight against NWS: nothing replaces “eyes on animals.”

“We’ve been preparing for the possibility of screwworms emerging back in Texas for the past year,” says Jason Sawyer, East Foundation chief science officer. “We have decided to take the attitude of preparedness. We expect we’re going to have it. How can we best manage it and best mitigate and really, how do we minimize the impact while we weather the storm?”

The Breakthrough Symposium: NWS Preparedness panel (pictured l to r) are: Jason Sawyer, East Foundation; Dr. TR Lansford III, Texas Animal Health Commission; Dr. Diane Kitchen, Florida Department of Agriculture; Stephen Diebel, Texas beef producer and Texas & Southwestern Cattle Raisers Association president; and Dr. Megan Schmid, USDA-APHIS.

(Angie Stump Denton)

Sawyer participated in a panel during the The Breakthrough Symposium: NWS Preparedness, hosted by Merck Animal Health. The panelists didn’t debate whether NWS will arrive — they spoke as if it is already on the way. For producers, that means decisions must be made months in advance: adjusting breeding and calving windows to avoid peak risk, investing in better handling facilities and building a clear response plan with veterinarians. Combined with federal and state surveillance using fly traps, animal inspections and producer reports, these risk‑based steps can help ensure that when NWS appears, it is found fast, hit hard and kept from spreading.

With cattle markets at all‑time highs, panelists warn NWS must be managed in a way that protects both animal health and commerce. Movement controls, inspection and treatment protocols, and animal disease traceability are being designed to regionalize the problem — not shut the industry down.

Here are seven key takeaways from the panel discussion:

1. Prepare, Don’t Panic

New World Screwworm is a serious but manageable threat with proper planning and coordination.

“This isn’t a ‘sell the ranch and get out of business’ problem,” Sawyer summarizes. “This is a ‘let’s figure out the best way to move forward and minimize impact.’” Today’s challenge is to rebuild the “lost muscle memory” with modern tools and a risk‑based mindset. That means planning calving seasons with NWS risk in mind, enhancing parasite control without driving resistance and being ready to isolate, treat and recheck any affected animals in close coordination with veterinarians. The sooner producers start planning, the smaller and shorter the “storm” will be for everyone.

Some strategies producers should consider include:

Get a premise ID now, if you don’t have one.
Consider shifting calving and processing into lower‑fly windows.
Manage wounds differently . Any break in the skin — navels, castration, dehorning, tags and tick bites — becomes a high‑risk site once NWS is in the area.

Dr. Diane Kitchen, a cattle rancher and Florida Department of Agriculture veterinarian manager, bovine and cervidae programs, suggests producers consider using a preventative or at least a protectant to the area to minimize the chance of an infestation occurring.

Sawyer, who manages ranches near the U.S.-Mexico border, explains. “We’re trying to work with the weather instead of against it and think about comprehensive parasite control strategies that can minimize that risk for newborn calves, knowing that we’re unlikely to be able to put our hands on every one of them as they hit the ground.”

2. Eyes on Animals, Surveillance is Central.

Nothing replaces routine, disciplined visual checks — especially of newborns and any animal with a wound. Kitchen says preparation starts with understanding NWS targets wounds and certain high‑risk areas. The fly’s preference is umbilical cords, she stresses.

“It can also affect certain mucus membranes,” she explains. “The corners of the eye, the genital tract. In particular, cows that are calving, they’re attracted to the same umbilical cord scent.” External wounds can be tiny, internal damage massive. “The wound itself externally may be very small,” Kitchen says. “The size of a quarter. But then when you go to treat there may be gallons of maggots within underneath.”

Producers who have dealt with the pest often describe it as a smell you’ll never forget , noting that the stench of a calf infested with New World Screwworm is often the first warning sign.

Dr. Megan Schmid, USDA-APHIS Cattle Health Center assistant director, explains there are two types of surveillance:

Active surveillance: Fly traps along the border, border inspectors and Wildlife Services checking animals
Passive surveillance: Producers, vets, shelters and others seeing maggots/myiasis and reporting. “The traps are helpful,” she says. ”But they’re not as sensitive as the animal inspection. So really, that’s the key part: everybody looking for the infestations in animals.”

Producers can use technology to get more “eyeballs” on cattle and keep spread to a minimum. Game cameras, virtual fencing and behavior tags can help producers find problems sooner when labor is tight.

Because these infestations can be deceptive, producers should learn to identify the specific signs of New World Screwworm , such as unusual discharge or larvae deep within living tissue.

3. Report First, Don’t Hide It.

NWS is a reportable foreign animal disease. Early reporting is critical and legally required. Officials would rather investigate 1,000 false alarms than miss one real case.

Kitchen stresses failure to report will create many more flies.

“Failure to report results in multiple generations of additional flies, which just dramatically increases the population that’s available to impact everybody,” she explains. “If you think that because you didn’t report yours, that it’s not going to be found. It will be found because it’ll be found in something else.”

She encourages producers to think about the impact on their neighbor.

If the roles were reversed, she asks, “If you hear that somebody, your neighbor, is one that didn’t report, how happy are you going to be with them?”

4. Vet Relationships Are Essential.

A veterinarian is central to preparation and treatment plan. For wound care, antibiotics, pain management and access to tools, a veterinary client–patient relationship is vital. Treatment is about parasite removal and wound management, guided by vets.

Panel members explain part of being prepared is sitting down now with your veterinarian and discussing: “If we get screwworm, what’s our plan? How often are we looking at cattle, what products are we going to use, and what do we do about movements?”

Read more about how NWS is an infestation, not an infection.

5. Wildlife Matters in This Fight.

Wildlife are a major reservoir and economic driver, and can suffer large population impacts without control. Kitchen predicts in infested areas 70% to 80% of white-tailed fawn crops could be lost.

“Our wildlife populations are both so much more abundant than they were in the 1950s and so much more valuable than they were in the 1950s,” Sawyer says. “Unfortunately, the opportunity to intervene for wildlife is much smaller. There’s really not very many strategies that are viable, and so surveillance and monitoring become really our front line of defense in terms of our wildlife populations.”

He suggests the best way to protect wildlife is aggressive control in livestock to reduce environmental burden.

6. Quarantines Are Tools, Not Punishments.

The goal is continuity of business with safeguards , not shutting down commerce. Regulators are trying to balance containment with commerce. The goal is to maintain the “speed of commerce” while using structured movement protocols to protect markets and disease-free areas.

“It’s not going to be business as usual, but it’s going to be business is still possible,” Schmid says. “The focus is: how do we allow safe movements, not restrict and stop business.”

She says the New World Screwworm Response Playbook includes guidance documents and explains the quarantine/movement framework.

Stephen Diebel, Texas beef producer and Texas & Southwestern Cattle Raisers Association president, encourages producers not to think in terms of a hard quarantine. A structured process of treatment, surveillance, inspection and certification will allow movement.

Dr. TR Lansford III, Texas Animal Health Commission assistant state veterinarian and deputy executive director, encourages producers to reference the lessons learned from fever ticks as a strategy for dealing with NWS. He notes experience with fever ticks has shaped how Texans think about area quarantines, treatment protocols and continuity of business.

7. More Tools in the Toolbox.

Panelist members summarize a holistic ectoparasite program using modern products plus strong producer education is a main NWS defense strategy.

Kitchen stress producers and veterinarians have many more tools than they did back in the ’60s and ’70s when NWS was last endemic in the U.S.

Producers can find a list of approved treatment and prevention strategies on the FDA website .

Sawyer suggests producers work with their veterinarians to plan prevention and treatment strategies. He also stresses the importance of considering resistance management.

“We don’t want to react to an emergent threat in a way that then creates problems with a persistent pest that’s already present,” he says.

Read More About How Sterile Flies are the No. 1 Tool to Fight NWS:
Doubling the Defense: USDA’s “Male-Only” Fly Breakthrough to Transform Screwworm Eradication
Border Remains Closed: Sterile Fly Production Facility Groundbreaking Next Step in Screwworm Fight

While NWS is a serious and emotionally charged threat, panelists remind producers the U.S. has pushed it back before — and can do it again.

“This pest existed here before, and it has been eradicated from the U.S. before,” Sawyer summarizes. “We know how to do it. We just have to sort of build the capacity and muscle to get it done again when we need to.”

New Dual-Route Vaccine Shows Promise Against Bird Flu in Cattle and Beyond

Mon, 27 Apr 2026 16:03:07 GMT

Highly pathogenic avian influenza (H5N1) is no longer just a poultry problem. Since its detection in U.S. dairy cattle in 2024, the virus has spread across herds, cutting milk production, driving economic losses and raising concerns about zoonotic transmission to humans. Infected cows can lose substantial milk output in a matter of weeks. The virus has been detected in milk, respiratory secretions and mammary tissue.

Despite this, there are currently no licensed influenza vaccines for cattle, leaving producers reliant on biosecurity and herd management to limit spread.

Against this backdrop, researchers at the University of Nebraska–Lincoln have developed a vaccine designed to keep pace with a virus that is both evolving and expanding its host range. Rather than targeting a single strain, the approach uses a centralized consensus H5 antigen, positioned near the center of the virus’s evolutionary tree to maximize cross-protection across variants.

Dual-Route Delivery Targets Where Infection Starts

What sets this vaccine apart is not just its breadth, but how it is delivered. Researchers combined intramuscular and intranasal administration, aiming to activate immune defenses both throughout the body and at the primary site of infection.

“The idea was that if we put it intramuscularly, we can prevent it from spreading in the body, and then a mucosal aspect, intranasally, would prevent it from spreading from animal to animal,” said Eric Weaver, professor of biological sciences and director of the Nebraska Center for Virology, in a news release .

This dual-route design is intended to generate:

Systemic immunity through circulating antibodies and T cells
Mucosal immunity in the respiratory tract, where influenza viruses first establish infection

Together, these responses may improve protection against disease while also reducing viral transmission.

The platform uses adenoviral vectors in a prime–boost regimen, switching vector types between doses to strengthen immune responses and avoid interference from preexisting immunity.

Strong and Broad Immune Responses

The vaccine was evaluated in both mice and Holstein dairy calves, with consistent findings across species. In each model, it generated robust immune responses spanning multiple arms of the immune system.

Antibodies isolated from animal serum and nasal swabs recognized a wide panel of H5 strains, from early isolates in the late 1990s through recent 2024 bovine strains. Mucosal IgA responses increased notably after booster vaccination, indicating the vaccine is effectively engaging respiratory immunity.

In parallel, strong T-cell responses were observed against both historical and contemporary viral strains, supporting the idea that protection may extend beyond traditional neutralizing antibody responses.

Complete Protection in Challenge Studies

In mouse challenge experiments, the vaccine demonstrated strong protective efficacy. Animals exposed to lethal doses of divergent H5N1 strains, including a recent bovine isolate, showed minimal clinical signs and survived infection.

Vaccinated mice maintained body weight and showed no significant disease
All unvaccinated controls experienced severe disease and were euthanized

This protection occurred even when neutralizing antibody responses were limited against some strains, suggesting broader immune mechanisms, including T cells, play a key role.

Still Early, but Promising

“We’d like to have a vaccine for the farm and the farmer, and everything shows that this would be an effective vaccine platform for humans as well,” Weaver said.

While the findings are encouraging, the vaccine remains in the experimental stage. The study did not include challenge trials in cattle, and questions remain about durability, field performance and effectiveness against fully virulent strains.

Even so, the results point to a meaningful shift in influenza vaccine design. By combining cross-reactive antigen targeting with dual-route delivery, this approach aims to anticipate viral evolution rather than react to it.

If those advantages hold up in real-world conditions, it could offer a much-needed tool for managing H5N1 in cattle and reducing the risk of further spillover.

Clearing the Air About Ammonia in Calf Hutches

Fri, 24 Apr 2026 17:52:43 GMT

Most calf hutches look fine from the outside. But what’s happening inside the hutch, especially at calf level, is not always as obvious.

When wet bedding and manure break down, they release ammonia. In hutches, it builds up right where calves are breathing. Even at fairly low levels, it can affect intake, growth and overall performance.

During a recent episode of The Dairy Podcast Show, David Casper, a dairy nutritionist and owner of Casper’s Calf Ranch in Illinois, explains how ammonia develops in calf hutches and what it means from a management standpoint.

Airflow is a Strength

Calf hutches continue to be widely used across dairies because they naturally provide strong ventilation and keep calves in individual spaces that are easy to manage. They also offer flexibility as herds grow and do not require the same level of infrastructure as enclosed barns.

“In my opinion, the hutch would still be the gold standard as far as having the best environmental quality you could have, especially air quality, and not have to deal with ventilation problems,” Casper says.

Even so, ammonia can increase as bedding becomes damp. By the time it’s noticeable, calves have already been exposed.

“When we started using soy hulls, I started noticing ammonia in the hutches,” Casper says. “I could smell it and really picked up on it. And that’s when we started getting concerned.”

That realization prompted a closer look at ammonia levels in hutches and how they relate to calf growth and health.

Measuring Ammonia

To better understand the issue, Casper evaluated ammonia levels in 90 calf hutches. Calves were placed in alternating hutches assigned to either a control or treatment group, and ammonia was measured weekly.

“Once a week, we come through with a personal ammonia detector that’s digital, and we would turn that with the measuring system face down on the bedding,” he says. “After 30 seconds, you get a stable reading, and that was the ammonia reading in the hutch.”

Control hutches averaged about 10 parts per million, while treated hutches averaged around 1.5 parts per million, an 85% reduction.

“We actually reduced the ammonia levels in the hutches by 85%,” Casper says.

That difference was significat, as performance challenges can begin once ammonia exceeds about 4 to 6 parts per million.

“Basically the range is four to six parts per million,” he says. “Above that, you will actually start seeing performance losses or performance challenges.”

Ammonia levels varied widely between hutches. Wetter bedding, scours and older calves were all associated with higher readings.

“Some hutches would have values up to 100 parts per million and other ones would be very low,” Casper says.

Ammonia also tended to increase later in the preweaning period as calves consumed more starter.

“For our studies, week seven and eight were probably the higher ammonia readings,” Casper says. “The first week had almost no ammonia readings because they’re on freshly bedded straw and fecal output is very minimal.”

Impact on Calf Growth

Lower ammonia levels were also tied to better performance. Calves in lower ammonia environments gained more weight during the preweaning period.

“We actually picked up on a growth response as well,” Casper says. “We got .14 pounds more average daily gain.”

Milk feeding remained the same, pointing to differences in intake and environment.

“The calves that were in the lower ammonia levels in the hutches ate more calf starter and had better growth rates,” he says.

Calves in lower ammonia hutches also showed greater increases in heart girth, indicating more overall body development.

Managing Ammonia in the Hutch

While most dairies are not measuring ammonia regularly, several management areas influence how much builds up in hutches.

Bedding is the biggest driver. Keeping bedding dry and well maintained helps limit ammonia. Deep straw provides insulation and absorbs moisture, but it needs to be refreshed regularly, especially later in the preweaning period.

“A calf can take a lot of cold weather if they’ve got deep straw bedding that they can nest down into and stay warm,” Casper says.

Moisture control is also important. Hutches with scours or poor drainage tend to have higher ammonia levels, so identifying problem hutches early can help target extra bedding or cleanout.

Smell is another indicator. If ammonia is noticeable when checking calves, levels are already elevated.

Timing matters as well. Ammonia tends to increase as calves get older and consume more starter, so bedding management often needs to be more aggressive in the later weeks before weaning.

A few practical hutch-specific steps producers can use include:

Add fresh straw more often in the back third of the hutch, where moisture tends to build first
Pull wet bedding away from the calf’s resting area instead of just layering on top
Pay close attention to hutches with scouring calves and re-bed them first
Check bedding depth at the calf level, not just at the front entrance of the hutch
Clean or fully reset hutches between groups when possible to reduce carryover moisture

Paying attention to these areas can help keep ammonia levels lower and support more consistent calf performance through the preweaning period.

Are We Treating the Wrong Cows for Metritis?

Thu, 23 Apr 2026 14:11:42 GMT

One in four dairy cows develops metritis. It’s one of the most common and costly diseases in the postpartum period.

But Caio Figueiredo, assistant professor at the College of Veterinary Medicine of Washington State University, raises the following uncomfortable question:

What if we’re not actually defining metritis correctly in the first place?

Because if the definition is off, everything downstream — diagnosis, treatment, antimicrobial use — follows it.

The Cracks Start at Diagnosis

In practice, metritis is diagnosed visually, using vaginal discharge scoring. It’s simple, fast and scalable across herds. Cows are generally scored on a scale of 1 to 5. The issue lies not within how to score cows, but in which scores define metritis.

“There isn’t a clear consensus of what discharge, on the clinical level, distinguishes a cow with metritis or not,” Figueiredo explains.

That lack of agreement directly shapes which cows get treated. So before we even talk about treatment protocols, we’re already dealing with a moving target.

Most scoring systems eventually funnel into two categories that matter clinically:

VD4: Purulent discharge
VD5: Fetid, watery, red-brown discharge

Both are commonly labeled “metritis” and both are commonly treated.

But they don’t look the same — and the data suggests they don’t behave the same either.

“Are these two conditions metritis? Should we treat both, or just one?” Figueiredo asks.

Despite the uncertainty, most dairies don’t differentiate, treating both VD4 and VD5 cows with antibiotics.

“Only a very selected group treat exclusively VD5 cows. The remaining dairies treat both conditions,” Figueiredo explains, referencing a survey of 45 dairies in California .

(Photos: Merck)

VD5 Looks Like a Different Disease

When you step back and look across studies, a consistent signal starts to emerge:

“There is some evidence that those groups are not necessarily the same,” Figueiredo states.

That difference becomes much harder to ignore once you look beyond the discharge itself.

Start with inflammation, which isn’t just a uterine issue.

“VD5 cows have greater levels of inflammation compared to those with purulent discharge (VD4),” Figueiredo says. “Those VD5 cows have greater systemic inflammation as well.”

At the microbial level, the pattern holds. A 2024 study looked at the uterine microbiome to investigate the differences between VD5 cows and all others.

“Only cows with vaginal discharge score 5 have greater bacterial count compared to the other discharges,” Figueiredo explains.

These animals had greater overall bacterial counts, as well as increased Fusobacterium, Porphyromonas and Bacteroides counts compared to lower-scoring cows. And when you zoom out to the whole animal, the separation becomes even clearer.

In unpublished data from Figueiredo’s lab, VD5 cows show:

Higher acute phase proteins (e.g., haptoglobin) postpartum
Worse liver function indicators (↓ albumin, ↑ bilirubin, ↓ cholesterol)
Altered metabolic profiles at diagnosis
Reduced rumination and activity during peak risk windows

These results suggest this is not just a discharge difference, but a systemic disease state.

Performance Consequences

The biological differences translate directly into outcomes.

In large multi-herd datasets VD5 cows had noticeably impaired performance:

Milk production: Up to 1,000 kg less milk over 300 DIM
Reproduction:
- Lower likelihood of resuming cyclicity
- Reduced probability of receiving first AI
- Lower pregnancy rates by 300 DIM
Survival:
- Higher risk of culling
- Faster removal from the herd

By contrast, VD4 cows were indistinguishable from lower score cows across many of these same parameters.

What Is VD4?

According to Figueiredo, if VD5 represents a true systemic disease, VD4 may represent something else — perhaps a milder, localized or even transient condition.

Across multiple datasets, VD4 cows perform similarly to their lower-scored herd mates.

Which raises a critical question: Are we treating cows that don’t actually need treatment?

The Economic Reality of Treating VD4 Cows

In the U.S. alone there are ~9.5 million dairy cows and a ~25% VD4 and ~25% VD5 incidence. That puts millions of cows into each category annually.

If both groups are treated:

Total antimicrobial treatment costs can exceed $500 million annually

If VD4 cows are excluded from treatment:

Potential savings approach $270 million per year

This difference in cost doesn’t account for labor, any effects of handling stress or the downstream impacts of antimicrobial use.

Why This Matters More Than It Seems

This isn’t just a classification issue. It touches multiple pressure points:

Antimicrobial Stewardship
Metritis is a leading driver of antibiotic use. Refining treatment criteria is one of the fastest ways to reduce unnecessary exposure.

Economic Efficiency
Treating cows that don’t benefit is pure inefficiency at scale.

Public Trust
Consumer concern around antimicrobial use continues to grow. Precision matters.

From Visual Diagnosis to Biological Precision

The takeaway isn’t to stop treating metritis, but to start treating it more precisely.

Right now, decisions are largely driven by what we can see. But the evidence suggests what we see doesn’t always reflect what’s happening biologically.

A more practical, data-aligned framework could look like:

VD5 → clear systemic disease → treat
VD4 → uncertain or mild → monitor, refine or selectively treat

This shift moves us away from a purely visual diagnosis model.

“We’re going to have to look deeper into the biology and then come back to the real-life problem,” Figueiredo says.

That means integrating:

Immune and inflammatory markers
Microbiome makeup
Metabolic and behavioral signals

The goal is straightforward: Align diagnosis with biology, not just appearance.

Ultimately, VD4 and VD5 cows don’t share the same biology, the same risk or the same consequences. One behaves like a mild or localized condition while the other is a true systemic disease with measurable impacts on performance and survival.

Treating them the same way is inefficient and outdated.

The future of metritis management isn’t about treating more cows, it’s about treating the right ones.

Lallemand Animal Nutrition Launches Ruminant Digestive Health Platform

Wed, 22 Apr 2026 14:13:02 GMT

A newly relaunched educational platform from Lallemand Animal Nutrition, rumantdigestivesystem.com , highlights a growing shift in cattle health management: Focusing only on the rumen is no longer enough to optimize performance, health and efficiency.

What Is a Whole-System Approach to Ruminant Digestive Health?

A whole-system approach evaluates the entire ruminant digestive tract, including both the rumen and lower gut, and how these compartments interact to influence:

Feed efficiency
Microbiome balance
Immune function
Disease risk

This approach reflects emerging research showing postruminal function plays a measurable role in overall herd outcomes.

From Rumen-Centric to Full Digestive Insight

Historically, ration formulation and digestive health strategies have centered on rumen fermentation. However, increasing attention is being placed on the lower gut, particularly its role in inflammation, nutrient absorption and systemic health.

To address this, Lallemand Animal Nutrition has expanded its interactive learning platform to cover the full digestive system, helping veterinarians and advisers connect research with practical management decisions.

The platform combines scientific data with applied insights, supporting a more complete understanding of how digestive function drives productivity and welfare.

Key Topics Covered in the Platform

The platform consolidates core areas of ruminant digestive health into a single resource:

Rumen–lower gut interactions
The ruminant microbiome and its function
Digestive development from calf to mature animal
Common challenges such as SARA, liver abscesses, leaky gut and BRD
The role of probiotics and microbial-based solutions

This structure helps translate complex digestive science into actionable strategies for on-farm use.

Using this Platform in Practice

The updated platform serves as a centralized, science-based tool to strengthen both decision making and communication among nutritionists, veterinarians and producers.

According to Lallemand, it supports a more comprehensive evaluation of digestive health issues by encouraging a broader view of the entire gastrointestinal tract. This allows for stronger integration of nutrition and health strategies, rather than addressing problems in isolation. It also helps veterinarians engage more confidently with emerging research, making it easier to incorporate new insights into practical recommendations. By shifting from a compartment-focused approach to a system-level perspective, veterinarians are better equipped to interpret multifactorial conditions where rumen and lower gut interactions influence outcomes.

The platform also functions as a practical communication tool.

Its interactive, visual format helps explain complex digestive processes in a way that is easier to understand and apply. This supports:

Clearer explanations of digestive function
Reinforcement of nutrition and management strategies
More effective discussions around performance and herd health

This improves the likelihood that recommendations are both understood and implemented on farm.

As ruminant nutrition research advances, translating new findings into daily practice remains a persistent challenge. By combining current science with real-world context, this platform helps bridge that gap, allowing veterinarians to apply emerging insights more effectively during herd visits and consultations.

A whole-tract approach to digestive health is becoming essential, and tools that integrate research with application will be critical in delivering more precise, system-based recommendations.

Hidden Pneumonia in Calves: Why More Dairies Use Ultrasound to Catch Respiratory Disease Early

Fri, 17 Apr 2026 20:06:17 GMT

Bovine respiratory disease (BRD) remains one of the most common and costly health challenges in preweaned dairy calves. The challenge is that many cases develop long before calves show visible symptoms.

“By the time calves show obvious clinical signs of respiratory disease, lung damage may already be present,” says Aerica Bjurstrom, regional dairy educator at the University of Wisconsin-Madison. “That’s why tools that help us detect pneumonia earlier can make a big difference in calf health and long-term performance.”

Traditional diagnosis relies on symptoms such as coughing, nasal discharge, or elevated temperature. But these signs often appear late in the disease process. In many cases, calves may look completely healthy while still carrying lung infections.

This form of illness, known as subclinical pneumonia, can reduce growth, feed efficiency and even future milk production.

“The lungs can really act as an indicator organ,” Bjurstrom explains. “Respiratory disease often reflects larger management challenges, such as poor colostrum intake, nutrition issues, or environmental stress.”

The Hidden Pneumonia Problem

Research has shown that pneumonia often develops days before visible symptoms appear.

“Ultrasound allows us to see what’s happening inside the lung tissue, even when the calf looks normal from the outside,” Bjurstrom says. “In many cases, pneumonia can be present for days before any clinical signs appear.”

Studies suggest that 50% to 80% of pneumonia cases may remain subclinical for 7 to 14 days before producers notice symptoms. That delay can allow lung damage to progress before treatment begins.

“Sometimes calves with severe pneumonia don’t show obvious symptoms,” Bjurstrom says. “But an ultrasound exam can reveal lung lesions that tell us the disease is already present.”

How Lung Ultrasound Works

Lung ultrasonography allows veterinarians to examine calf lungs in real time using portable ultrasound equipment.

A normal lung appears air-filled on the scan and produces horizontal white lines that move with each breath. These lines indicate healthy lung tissue.

Changes in the image can reveal early disease.

“Comet tails are bright vertical lines that extend down from the lung surface,” Bjurstrom says. “A few may be normal, but severe or diffuse comet tailing can suggest interstitial disease caused by fluid or inflammation within the lung.”

More advanced disease appears as lung consolidation, where portions of the lung fill with inflammatory material instead of air. On ultrasound, these areas appear as solid gray regions.

Veterinarians often use a 0 to 5 lung scoring system to evaluate severity.

“This scoring system helps identify disease before calves begin coughing or showing nasal discharge,” Bjurstrom says. “Early detection allows for earlier treatment and better outcomes.”

Dr. Ollivett demonstrates positioning for thoracic ultrasound scanning on a calf’s right lung.

(Denise Garlow, University of Wisconsin)

Why Early Detection Matters

Even when calves show no visible symptoms, lung damage can affect their long-term performance.

In one study of more than 600 Holstein heifers, calves with lung consolidation detected at weaning were less likely to become pregnant and more likely to leave the herd before first calving.

Another study found calves with significant lung lesions in the first eight weeks of life produced 1,155 pounds less milk during their first lactation.

“These findings highlight why early detection matters,” Bjurstrom says. “Subclinical disease can still influence growth, reproduction, and milk production later in life.”

Improving Treatment Outcomes

Early detection can also make treatment more effective.

“When pneumonia is caught earlier, treatment tends to work better,” Bjurstrom explains. “We’re able to intervene before the disease becomes severe and causes permanent lung damage.”

Ultrasound can also help veterinarians monitor recovery.

“That monitoring aspect is important,” she says. “It helps ensure calves are improving and reduces unnecessary retreatment.”

A Management Tool for Farms

Beyond diagnosis, lung ultrasound is increasingly used as a herd management tool.

“Ultrasound gives producers objective information about lung health,” Bjurstrom says. “That can help guide decisions about treatment, culling, or adjusting weaning timing for calves that may need more time to recover.”

Regular scanning can also reveal herd-level trends tied to management practices.

“When used consistently, ultrasound becomes a benchmarking tool,” Bjurstrom says. “It can help farms evaluate colostrum programs, ventilation, sanitation, and other factors that influence calf health.”

A Growing Tool in Calf Health Programs

Portable ultrasound units have become more accessible and easier to use, making them more common in calf health programs. With proper training, scanning a calf’s lungs typically takes less than a minute.

“The equipment requires an initial investment, but the information it provides can be incredibly valuable,” Bjurstrom says. “Earlier detection can lead to better management decisions, improved calf growth, and fewer losses.”

As dairy farms continue adopting more data-driven management practices, lung ultrasound is giving producers a new way to detect disease sooner and protect the long-term potential of their calves.

“Lung ultrasound helps us move beyond waiting for visible symptoms,” Bjurstrom says. “It allows producers and veterinarians to identify problems earlier and take action before long-term damage occurs.”

Global Expansion of Foot-and-Mouth Disease Serotype SAT1 Raises Alarms

Wed, 15 Apr 2026 17:42:36 GMT

Recent reports of the emergence and spread of foot-and-mouth disease virus (FMDV) SAT1 serotype are highlighting a concerning shift in the global landscape of this virus. The Swine Health Information Center-funded Global Swine Disease Monitoring Reports, led by Dr. Sol Perez at the University of Minnesota, have highlighted the newly affected countries in monthly publications.

“For FMDV, immunity is serotype-specific, meaning infection or vaccination against a given serotype does not confer protection against a different serotype,” Perez says in a SHIC article.

A Rapid Geographic Shift

Historically, SAT1 was maintained within endemic locations in East and Southern Africa. However, in 2025, SAT1 demonstrated a “concerning expansion” beyond its traditional geographic range, with confirmed detections of two cocirculating subtypes across Western Asia and North Africa. The increasing circulation of SAT1 poses a growing risk to previously unaffected regions, including southeast Europe and potentially beyond. As this serotype expands its geographic range, it creates additional pathways for introduction into new regions and countries, increasing the overall likelihood of transboundary spread, Perez notes.

The Immunity Gap

The primary concern for animal health officials is that FMDV immunity is serotype-specific. Current vaccination programs in many affected regions target serotypes O, A and Asia-1. Because these vaccines provide no cross-protection against SAT1, livestock populations remain effectively susceptible, research shows. This “ecological space” has allowed SAT1 to spread rapidly through populations that were previously considered protected.

Drivers of FMD Transmission

SAT1’s expansion is likely due to several factors, Perez says.

Livestock Movement: Informal cross-border movement of small ruminants, which may carry subclinical infections, is a primary driver.
Environmental Pressures: Drought and land-use changes have increased contact between wildlife reservoirs and domestic herds.
Vaccine Limitations: A lack of SAT1-specific vaccine stockpiles and gaps in surveillance have hindered rapid response efforts.

FMD Implications for the United States

Although the U.S. remains free of FMD, the expansion of SAT1 into new regions of the world increases the complexity of global risk, Perez says. The emergence of two cocirculating subtypes (topotypes SAT1/I and SAT1/III) creates more pathways for the virus to enter the U.S. via international travel, contaminated animal products, or fomites.

“These global developments underscore the need to strengthen early detection and surveillance systems, maintain stringent biosecurity measures across livestock value chains, and ensure that vaccine preparedness strategies are sufficiently flexible to incorporate emerging serotypes such as SAT1,” Perez says.

For the U.S. pork industry, this serves as a critical reminder to maintain stringent biosecurity measures and support global monitoring efforts to prevent a domestic outbreak.

The Genetic Pivot: How 2026 Wellness Traits are Redefining Dairy Profitability

Fri, 10 Apr 2026 17:16:14 GMT

For decades, the perfect cow was defined by a single metric: the bulk tank. If she produced a mountain of milk, she stayed in the herd. But as the dairy industry enters 2026, the definition of success has undergone a radical transformation. Today’s producers are operating in a world where feed costs, heat stress, carbon footprints and supply chain demands are just as critical to the balance sheet as total pounds of milk.

To meet this complexity, genetic selection has evolved from a simple production index into a high-precision roadmap for survival. The recent 2026 updates to Zoetis’ Clarifide Plus and the Dairy Wellness Profit Index (DWP$) represent more than just incremental data points; they represent a strategic shift toward bulletproofing the dairy cow for a more volatile future.

The New Math of the $100 Gain

The core of the 2026 update is an economically weighted index designed to balance income drivers against expense drivers. In the current market, a genetic index must do more than predict output; it must predict the cost of that output.

According to Zoetis data, achieving a $100 increase in the DWP$ 2026 index translates into measurable lifetime profit across five critical pillars:

$61 in quality production — Modernizing the focus on components and volume.
$19 in antibiotic stewardship — Selecting for cows that naturally resist disease, reducing the need for intervention.
$8 in animal welfare — Prioritizing longevity and physical soundness.
$6 in fertility — Ensuring the cow stays on cycle and in the herd.
$6 in precision nutrition — Maximizing the conversion of feed to milk.

“The 2026 updates provide dairy producers with additional precision in breeding for cows that are profitable, efficient and sustainable,” says Nick Randle, senior marketing manager for U.S. dairy productivity and milk quality at Zoetis. The goal is to move away from blanket management and toward more precise animal care informed by predictive insights.

Breeding for a Warming World: Heat Resilience

One of the most significant additions to the 2026 toolkit is the introduction of DWP$ Heat. For decades, producers in the South and West have relied on mechanical cooling — fans, misters and cross-vent barns — to mitigate the devastating effects of the Temperature Humidity Index (THI). However, management alone has its limits.

Zoetis has introduced two new traits to tackle this biologically:

Fertility Heat Resilience (Z_FR) — This trait predicts the change in the probability of a first-service conception rate as THI increases.
Milk Heat Resilience (Z_MR) — This predicts the stability of daily milk production as the heat rises.

By incorporating these traits, producers can breed a herd that maintains its “cool” during the 20% of the year when heat stress typically ravages the bottom line. It’s a recognition that resilience and profitability are now inextricably linked.

The Feed Efficiency Frontier: Z_RFI and RUMiN

Feed remains the single largest expense on any dairy, often accounting for 65% of the total budget. Historically, selecting for feed efficiency was difficult because it was hard to measure on individual cows in a commercial setting.

The inclusion of Zoetis Residual Feed Intake (Z_RFI) changes that. This trait measures the dry matter intake that cannot be accounted for by milk production or body weight. In simpler terms: It identifies the cows that eat less than expected without sacrificing a single pound of milk. In validation analyses, the top 25% of animals ranked by Z_RFI consumed 2.2 lb. less dry matter per day than their peers. Across a 20,000-cow herd, that 2.2-lb. difference represents a staggering shift in the feed bill.

Simultaneously, the RUMiN trait predicts the genetic potential for enteric methane production. While methane was once seen only as an environmental metric, it is increasingly becoming a market-access requirement.

The Supply Chain Connection: The Danone Factor

The revolution in genetics is not just happening on the farm; it’s being driven by the processor. In 2024, Zoetis and Danone formed a strategic partnership to advance sustainable production. For a global giant like Danone, which has committed to cutting methane emissions by 30% by 2030, the genetic makeup of their suppliers’ herds is a critical lever.

“Genomic testing of our farmers’ herds plays an important role in our global methane reduction strategy,” says Anco van Schaik, global director of procurement at Danone. By selecting for the Milk Methane Intensity (Z_MI) trait, producers can demonstrate to their buyers that they are producing lower-carbon milk at scale. This isn’t just about being green; it’s about ensuring that a farm remains a preferred supplier in a carbon-conscious marketplace.

The graph shows a projection of the improvement in methane intensity in one of Danone’s dairy herds year over year based on its DWP$ genetic progress.

(Zoetis)

Proof of Concept: McCarty Family Farms

The theoretical value of these genetic updates is best illustrated by real-world results. At McCarty Family Farms in Rexford, Kan., the 2025 Milk Business Leader in Technology award winner the pursuit of genetic optimization has fueled a massive operational expansion.

In 2011, the McCartys milked 7,000 cows with an average daily production of 70 lb. per cow. Today, they milk nearly 20,000 cows, and their productivity has soared to over 100 lb. per cow daily.

“You can’t manage what you can’t measure,” Ken McCarty says. “We’ve increased productivity by almost 50%.”

But the growth wasn’t just in volume. By leveraging genomic insights like DWP$, the McCartys have driven their somatic cell count down to a range of 120,000 to 180,000 — a hallmark of superior animal welfare and milk quality.

For the McCartys, the focus on specific indexes like TPI and DWP$ with Clarifide Plus is the engine behind their mating and breeding strategies. It allows them to select for a cow that isn’t just a milk machine but rather a sustainable asset that fits their specific environmental and economic goals.

The End of the Average Cow

The 2026 update to Clarifide Plus and DWP$ marks the end of the era of the average cow. In a world of tight margins and high scrutiny, there is no longer room for animals that don’t pull their weight in efficiency, health and resilience.

By combining wellness, performance and sustainability into a single, profit-driven index, the industry is moving toward a more individualized form of animal care. As Brett Bristol, head of precision animal health at Zoetis, notes, the goal is to empower producers to “advance both environmental stewardship and overall herd profitability within a single, comprehensive index.”

For the modern dairy producer, the message is clear: The most valuable tool in the barn isn’t just the parlor or the feed wagon; it’s the DNA of the heifer standing in the hutch.

USDA’s "Male-Only" Fly Breakthrough to Transform Screwworm Eradication

Fri, 10 Apr 2026 15:27:41 GMT

USDA’s Agricultural Research Service (ARS) is advancing the next evolution of the long-trusted sterile insect technique (SIT) to protect U.S. livestock from New World screwworm (NWS) by introducing a 100% male-only sterile fly strain. This breakthrough will effectively double the production capacity of sterile fly facilities without expanding physical infrastructure. By eliminating the production of “useless” female flies, the USDA-ARS innovation aims to push the NWS fly further south, providing a more robust and cost-effective defense for American livestock producers.

A USDA spokesperson explains, “USDA is using gold standard, proven scientific methods to manufacture NWS flies to produce only male flies and increase the efficiency of SIT. USDA is simply making a proven tool even more efficient and effective to better protect America’s farmers and ranchers.”

USDA currently produces sterile flies for dispersal at the COPEG facility in Panama. USDA is also investing $21 million to support Mexico’s renovation of an existing fruit fly facility in Metapa — which will double NWS production capacity once complete.

Moore Air Base: On Time and On Budget for 2026 Production

Dudley Hoskins, USDA under secretary for marketing and regulatory programs, was a guest Tuesday on AgriTalk. He discussed sterile fly dispersal efforts.

“We’re doing two things,” he says. “One, the Secretary has us modernizing our infrastructure and our production capacity. She has us working on Moore Air Base, which will be a sterile fly production facility, that when it’s finally complete and at max-capacity production, will be producing about 300 million sterile flies per week. ”

Deputy Secretary Stephen Vaden recently reported USDA is on track and on time with regard to the Moore Air Base facility near Edinburg, Texas.

The Science of Stopping the Spread: Why Male-Only Matters

SIT, when paired with surveillance, movement restrictions and education and outreach, is an effective tool for controlling and eradicating NWS. Female NWS flies only mate once in their lives, so if they mate with a sterile male, they lay unfertilized eggs that don’t hatch. Releasing sterile flies just outside of affected areas helps ensure flies traveling to new areas will only encounter sterile mates and will not be able to reproduce.

Hoskins says concurrent to the process at Moore Air Base, USDA is working with its partners at the ARS and Environmental Protection Agency (EPA) to evaluate the genetically-engineered fly — the NovoFly — which would help get more male flies in the sterile fly production facility.

Vaden calls the possibility exciting.

“Basically we’ve been losing half of the production at every facility because what we need are sterile male flies, but of course with nature, half of what you get are female flies, and those to this particular enterprise are useless,” he explains. “Thanks to our agricultural research service, we now have the ability to pump out 100% sterile male flies only, no wastage. That has the effect of doubling production without any change in the available facilities.“

He adds, “We expect to be able, once EPA approves that innovation is safe later this year, to have all those facilities, including the one under construction at Moore Air Base, pumping out 100% sterile male flies, which will make our ability to push this pest back further south where it belongs to take root and begin to have great effect. Not just to hold it, but to push it further south.”

Hoskins summarizes, “All of those things are in motion, all things happening concurrently, and all those will be critical in modernizing our toolbox to take the fight to the screwworm.”

Listen to the conversation on AgriTalk :

Regulatory Road Map: The EPA Public Comment Period

USDA is following established regulatory pathways and submitted to EPA an Emergency Use Exemption and Application for Registration. EPA published the notice of receipt and request for comments in the Federal Register on March 27 and is accepting public comments until April 27 before making a determination.

According to the notice, the application from USDA states: “To register a new pesticide product containing an unregistered pesticide, NovoFly male-only genetically engineered (GE) New World screwworm (NWS) in USDA’s Sterile Insect Technique (SIT) programs. Additionally, the Agency received a Section 18 quarantine emergency exemption application requesting use of the same pesticide to maintain broad suppression of and help prevent the pest from moving further northward from Mexico toward the United States.”

EPA is providing the notice in accordance with the Federal Insecticide, Fungicide and Rodenticide Act (FIFRA).

The notice says, “Due to the urgent nature of the emergency, the limited time available to authorize the Section 18 quarantine emergency exemption request and the related FIFRA Section 3 product registration application under review for the same use, EPA is waiving the comment period associated with the emergency exemption request but is soliciting public comment in conjunction with the application for Section 3 product registration of NovoFly.”

To make comments or learn more, visit the EPA website .

Read more about sterile flies and current distribution:

USDA Updates New World Screwworm Response Playbook for Ranchers and Vets

Thu, 09 Apr 2026 12:40:45 GMT

The “ New World Screwworm Response Playbook” was developed as a resource to help animal health officials and responders manage and adapt their response if NWS is found in the U.S. The first draft of the Playbook was released in October 2025.

U.S. Department of Agriculture’s (USDA) Animal and Plant Health Inspection Service (APHIS) released an updated Playbook to serve as a comprehensive guide to support coordinated, science-based action should NWS be detected.

“USDA continues to execute Secretary Rollins’ five-pronged plan to keep NWS out of the United States,” says Dudley Hoskins, USDA under secretary for marketing and regulatory programs. “While we are aggressively safeguarding American agriculture and working with Mexico to prevent further northward spread, we must also ensure that our domestic response plans are ready for immediate activation. Strong coordination with states, producers, veterinarians, sportsmen and other partners is essential to achieving that goal.”

Hoskins was a guest Tuesday on AgriTalk. He discussed NWS preventative and response measures, including the sterile fly dispersal efforts.

He explains the goal of the Playbook is to try to balance that constant posture of vigilance, prevention and emergency response coordination.

“We want to be as least disruptive to the industry and commerce as possible,” he explains.

Hoskins stresses APHIS is asking for feedback on version two of the Playbook as they continue to fine-tune the response plan.

“We’re asking that same community of states and industry partners to continue to review the playbook,” he explains. “We want to continue to have those discussions and and those deliberations to improve the can and hopefully perfect have to use it, and hopefully never have to use it.”

Refining the Rules: Key Updates to the 2026 Playbook

The updated Playbook outlines critical science-based strategies for federal, state, tribal and local responders, including how to:

Coordinate response operations
Reduce spread and prevent establishment of NWS in new areas
Manage the pest in infested animals
Implement NWS fly surveillance and control measures
Maintain continuity of business
Support efficient information flow and situational awareness

APHIS has released the updated New World Screwworm Response Playbook - strengthening preparedness via coordination with states, producers, veterinarians, wildlife & other partners.🤝
It guides rapid, science-based action should NWS be detected in the U.S.https://t.co/lgplvaNjDy pic.twitter.com/kq4wKbqkGY
— USDA Animal and Plant Health Inspection Service (@USDA_APHIS) April 8, 2026

Collaborative Design: Incorporating Tribal and Industry Expertise

After sharing the draft Playbook in October 2025, APHIS worked to gather feedback from state animal health officials, federal partners, livestock and wildlife industry groups, tribal partners, veterinary organizations and other key stakeholders to prepare the updated version.

According to the APHIS press release , “Their expertise and operational experience were essential in shaping practical, field-ready guidance for real-world response scenarios.”

Based on this feedback, APHIS made several key updates to the Playbook including clarifying and expanding:

Terminology — NWS establishment, suspect, zones, types, phases, quarantines — treatment versus preventative NWS animal drugs and pesticide products
Agency roles, responsibilities and authorities
Animal movement requirements
Wildlife management, including:
- Improved description of roles, responsibilities and authorities related to wildlife
- Added and improved definitions of confined, farmed, and free-ranging wildlife
- Refined guidance on use of antiparasitic drugs and pesticide for use on/in wildlife
- Development guidance on wildlife surveillance

Accessing the Playbook: Resources for Producers and Responders

APHIS updated four supplemental guidance documents that were posted with the draft Playbook and added an additional eight supplemental guidance documents, all referenced in the Playbook .

(USDA APHIS NWS Playbook)

“To ensure continued alignment with state-level plans and industry practices, APHIS will continue to revise the Playbook as preparedness activities advance and evolve,” the release explains. “The agency will continue to work directly with states, territories, tribes, federal agencies, industry wildlife and other partners to refine response tools, strengthen coordination and support joint planning efforts.”

Your Next Reads:

New Genetic Insights Could Help Dairy Industry Tackle Crampy in Cattle

Fri, 03 Apr 2026 14:55:39 GMT

A long-mysterious condition that has quietly contributed to premature culling and lost lifetime productivity in dairy herds may finally be coming into focus. New research from the University of Guelph shows bovine spastic syndrome, or Crampy, is not just unpredictable, but genetically influenced — and increasingly manageable through selection.

The study, which analyzed more than 54,000 Holstein cattle across 678 Canadian herds, identified multiple genomic regions associated with the condition and demonstrated that incorporating this information into breeding programs improves prediction accuracy. Previous work had suggested a genetic link, but this large-scale dataset both quantifies heritability and pinpoints specific regions tied to disease risk.

What is Crampy?

This chronic neuromuscular disorder typically appears in adult cattle, most often between 2 and 7 years of age. It is characterized by intermittent muscle spasms, usually beginning in the hind limbs. Early signs can be subtle, including stiffness or brief tremors, but episodes may progress in severity and duration over time.

As the condition advances, mobility declines. In many cases, affected animals are ultimately removed from the herd due to welfare concerns and reduced productivity.

Crampy has long been suspected to have a genetic component, but the lack of clear markers has limited the ability to act on that assumption. Environmental and metabolic factors have been explored, yet they have not consistently explained disease occurrence. As a result, control has relied on observation and culling rather than prevention.

What the New Research Shows

The new study confirms Crampy is moderately heritable, meaning genetics plays a meaningful — but not exclusive — role in whether an animal develops the condition.

Researchers identified 41 significant single nucleotide polymorphisms associated with Crampy across the genome. Many of these markers are located near genes involved in neuromuscular signaling, ion transport and muscle contraction, which closely align with the clinical signs observed in affected cattle.

The analysis also uncovered genetic correlations with mineral-related traits, including calcium and zinc balance. While these relationships do not establish causation, they provide biological plausibility and suggest disruptions in mineral handling and nerve excitability may contribute to disease expression.

From a selection standpoint, one of the most important findings is the improvement in genomic prediction accuracy. When genomic information was included, reliability of breeding values increased by up to 17% compared to traditional approaches. In practical terms, this means producers and breeding programs can identify higher-risk animals with greater confidence, even before clinical signs appear.

Importantly, the study found no strong antagonistic relationships with major production traits, indicating selection against Crampy can be incorporated into existing breeding goals without compromising performance.

What Does This Mean for Treatment and Management?

There is no effective treatment for Crampy. With no reliable medical or nutritional intervention available, control has historically depended on management decisions:

Culling severely affected animals
Reducing handling stress to limit episode triggers
Avoiding use of affected animals in breeding decisions

This has made long-term control difficult under traditional approaches and reinforced the need for preventive strategies.

A Shift Toward Prevention

What this research changes is the ability to act proactively.

With clearer genetic markers and improved prediction tools, breeding decisions can play a central role in reducing the condition over time. This also increases the importance of identifying and recording affected animals at the herd level.

For bovine spastic syndrome prevention:

Record and track suspected Crampy cases consistently
Flag affected cow families when making breeding decisions
Work with genetic advisers as selection tools become available
Avoid retaining replacements from clearly affected lines

Crampy remains a challenging condition, but the path forward is becoming more defined — shifting the focus from reacting to individual cases to systematically reducing risk at the population level.

Axiota Animal Health Names Wamego as Global Headquarters

Fri, 03 Apr 2026 14:36:35 GMT

Axiota Animal Health, a global leader in cattle health solutions, announced it will name its facility in Wamego, Kan., as the company’s global headquarters.

The announcement formalizes the longstanding presence of Axiota Animal Health in Wamego, where the company operates manufacturing, research and development, and scientific operations for its products used by cattle producers in more than 30 countries worldwide.

“Wamego has long been a cornerstone of Axiota’s manufacturing and research, so designating it as our global headquarters is a natural next step,” says Bill Weldon, Axiota Animal Health CEO. “From here, we’re developing and producing technologies that help cattle producers around the world improve herd health and productivity. Leveraging our location within the KC Animal Health Corridor and our longstanding relationship with Kansas State University allows us to drive innovation and attract the top talent the industry demands.”

Located near K-State, the facility benefits from proximity to one of the nation’s leading veterinary and animal health research institutions. That connection helps Axiota attract specialized scientific talent and collaborate with researchers advancing the future of livestock health.

From its Wamego facility, Axiota supports cattle producers worldwide in improving herd health and performance through prevention-based, nonantibiotic solutions. This includes:

Lactipro , the only rumen-native probiotic that delivers Mega e, proven to promote rumen health and performance.
Multimin 90 (zinc, copper, manganese and selenium injection) is the only FDA-approved injectable supplement that delivers four trace minerals known to support cattle health and reproduction.

The decision highlights the global impact of the KC Animal Health Corridor , a hub stretching from Manhattan, Kan., to Columbia, Mo., with Kansas City at its heart. The region, home to the world’s largest concentration of animal health assets, serves as a leading center for life science research, development and collaboration.

“Axiota’s decision to locate its global headquarters in Wamego reflects the industry leadership that continues to define the corridor,” says Kimberly Young, president of the KC Animal Health Corridor. “Companies here aren’t just participating in the industry — they’re driving the science, technology and production that support animal health and food security around the world.”

Better Colostrum Decisions Start with the Right Tools

Mon, 30 Mar 2026 19:39:55 GMT

Not all colostrum is created equal, and understanding its quality can influence how well calves get started. That’s why having the right tools to measure colostrum quality can help producers make better feeding decisions for newborn calves.

Immunoglobulin (IgG) levels in colostrum can vary widely, from less than 20 mg/mL to more than 100 mg/mL depending on factors like the cow’s breed, health history, season and how much colostrum she produces. In general, colostrum with at least 50 mg/mL of IgG is considered high quality and provides the antibodies calves need for a strong start.

Because of that variation, appearance alone is not a reliable way to judge colostrum quality. Many producers use on-farm tools to measure IgG levels and sort high-quality colostrum from the rest. Two common options are the colostrometer and the Brix refractometer, each with its own pros and cons, according to Jud Heinrichs, Professor Emeritus of Dairy Nutrition at Penn State University, and Coleen M. Jones, former research associate in dairy.

colostrumfeeding.jpg

Colostrometer

The colostrometer is a hydrometer that floats in a sample of colostrum and measures its specific gravity. The tool is placed in a cylinder of colostrum and allowed to float freely. A color-coded scale estimates the IgG concentration: green indicates more than 50 mg/mL and high-quality colostrum, yellow falls between 20 and 50 mg/mL, and red shows less than 20 mg/mL.

Because of the color scale, the colostrometer is best used to sort colostrum into general quality categories rather than to measure an exact IgG value. This makes it easier to identify which colostrum is ideal for the first feeding and which should be saved for later feedings or mixed with transition milk.

The Pros:

Simple and inexpensive, usually under $100.
Lets you quickly separate high-quality colostrum from lower-quality batches.
Can test several samples from the same milking.

The Cons:

Temperature matters. Room temperature (around 72°F) gives the most accurate reading. Colder colostrum will look better than it is, and warmer colostrum will look worse.
Other components in colostrum, like fat and protein, can affect readings. It’s better for sorting than for precise IgG numbers.
The colostrometer is made of glass, so it can break if it’s dropped or handled roughly.

Brix Refractometer

A Brix refractometer is normally used to measure sugar, but it can also give a good estimate of IgG in colostrum. To use it, just place a few drops of colostrum on the prism, lower the cover and the digital display gives a quick, easy-to-read Brix value.

A reading of 22% or higher usually means the colostrum contains 50 mg/mL of IgG or more, making it adequate for newborn calves. Research shows the Brix refractometer tends to match lab-tested IgG levels better than a colostrometer, and it’s less fragile., which makes it easier to handle day after day without worrying about breaking it.

The Pros:

More accurate than a colostrometer.
Sturdy, especially digital models.
Works well across a range of colostrum temperatures and even frozen or thawed samples.
Can also estimate total solids in milk or IgG in calf serum.

The Cons:

Optical models can be tricky with high-fat colostrum because the line can blur. Digital models read it more clearly.
Slightly higher cost for digital models, but farm-friendly options are available for under $100.
Needs regular cleaning and occasional calibration to keep it accurate.

Both tools give farmers a practical way to know which colostrum will help calves get a strong start. The colostrometer is simple and inexpensive, perfect for separating the best colostrum from the rest. The Brix refractometer is more accurate and easier to read with thick, fatty colostrum. Either tool can help make sure calves get enough IgG to grow healthy and stay well.

Where Euthanasia Delays Begin on Farm

Mon, 30 Mar 2026 17:36:42 GMT

Perhaps you have experienced a similar situation: there is a down cow that lingers longer than it should, or a calf that continues to decline despite repeated reassessment, and eventually it becomes clear the issue was not a lack of effort, but a delay in acting when the outcome was already decided. These cases tend to stick with you because they reveal something deeper about how decisions actually unfold on the farm.

As Dr. Mariana Guerra-Maupomé, professional services veterinarian with TELUS Agriculture, puts it, “The main problem is not the lack of guidance. We have plenty of standards and guidelines. The main problem is the failure to turn concern into timely action.”

Most farms are not struggling because they lack knowledge, but because their systems do not consistently support acting at the right time, even when the need is recognized.

Beyond the Euthanasia Method

Euthanasia discussions often center on technique, and that makes sense. Proper execution is important. However, when you step back and look at where things break down, the issue is rarely how euthanasia is performed. More often, it is when the decision is made and how long it takes to move from recognition to action.

This is where the two-clock model becomes especially useful for veterinarians trying to diagnose system failures on farm.

“Clock 1 starts when a compromised animal is identified to when the decision is made, the decision to euthanize. Clock 2 starts when the decision to euthanize is followed by the procedure of euthanasia and the confirmation of that,” Guerra-Maupomé says.

In practical terms, the model separates euthanasia into two distinct types of delay:

Clock 1: Recognition-to-decision delay
Where uncertainty, unclear thresholds or hesitation slow downs the decision itself
Clock 2: Decision-to-action delay
Where logistics, training or equipment affects how quickly euthanasia is carried out

Most farms have invested effort in improving Clock 2, ensuring once a decision is made the procedure is performed correctly and efficiently. The larger and more persistent challenge lies in Clock 1, where unclear expectations or hesitation can delay decisions by hours or even days.

This distinction matters, because it shifts the focus from refining technique to understanding why action is not happening sooner.

Delay Is More Than a Welfare Problem

It is easy to frame delayed euthanasia strictly in terms of animal welfare. But in a production setting, the consequences extend well beyond that. Delayed decisions affect not just the animal, but the broader operation.

“Late euthanasia creates three types of risk: clinical risk, animal welfare risk and business or compliance risk. With euthanasia being delayed, there’s non-compliance to audit, reputational risk for the industry and supply risk for the industry as well,” Guerra-Maupomé says.

Positioning euthanasia within this broader context often resonates more strongly with producers, because it connects timely decision making to efficiency, compliance and long-term sustainability, rather than isolating it as a standalone welfare issue.

Where Systems Tend to Break Down

When delayed cases are reviewed, the same patterns tend to emerge reflecting a lack of clarity in how decisions are structured and communicated. One of the most consistent issues is vague guidance around reassessment. Without clear expectations, cases drift and repeated evaluation replaces decisive action.

“Stop using vague language like ‘Let’s monitor or recheck later.’ Define exactly when you are going to check. The decision trees suggest checking in less than 24 hours, but I would encourage you that you can even check in six to 12 depending on the severity,” Guerra-Maupomé says.

This is where Clock 1 quietly ticks on. Each undefined “recheck later” adds time. Without a clear endpoint, the system defaults to waiting rather than progressing toward a decision.

Role Clarity Keeps the Clocks Moving

Even when the clinical picture is clear, delays can still occur if roles are not well defined. When responsibility is ambiguous, decisions are often deferred, and cases stall despite obvious need. Strong systems prevent that by establishing a clear flow of responsibility.

“The caretaker identifies a compromised animal and escalates. The supervisor makes a decision to euthanize the animal. Next, a trained operator executes the procedure promptly, and then the operator or supervisor confirms that and documents,” Guerra-Maupomé explains.

This structure helps keep both clocks moving, ensuring once a problem is identified, it progresses steadily toward action without unnecessary delay.

The Veterinarian’s Role in Euthanasia Decisions

This type of structure also changes how veterinarians fit into the process. In many operations, euthanasia decisions still depend heavily on veterinary input, which can unintentionally slow things down, particularly when access is limited or communication is delayed.

A more effective approach positions the veterinarian as a system designer and reviewer.

As Guerra Malcome explains: “The veterinarian should never be the bottleneck for a case. The veterinarian is there to help train, audit and review the system. A veterinarian has an oversight role and can help at every single step.”

When farms operate this way, decisions can be made promptly on site while still benefiting from veterinary guidance, training and ongoing oversight.

The Human Side of Delay

It is also important to recognize not all delays are structural. Some are human, and those factors can be just as influential.

These challenges tend to show up in predictable ways on the farm:

Hesitation in clear-cut cases, even when prognosis is poor
Repeated reassessment without escalation, particularly in borderline animals
Avoidance of decision-making, especially among less experienced staff

This is where system design intersects with human behavior.

“A clearer and more structured system does not just improve decisions. It also lifts a weight off the staff. By providing clear protocols and structured support, we reduce ambiguity, delay and the staff burden,” Guerra-Maupomé says.

Reducing ambiguity helps reduce hesitation, which in turn shortens Clock 1 and improves outcomes.

Insight Into Action

Improving euthanasia outcomes does not require complex interventions, but it does require intentional system design and follow through. A few focused changes can make a meaningful difference:

Define clear, time-based reassessment points so Clock 1 does not drift
Assign primary and secondary decision makers to prevent hesitation
Ensure trained personnel are available to carry out euthanasia promptly
Review both clocks regularly to identify where delays are occurring

These steps help create a system where decisions are made and acted on consistently, rather than reactively or inconsistently.

A Process, Not a Moment

Euthanasia is often thought of as a single act, but in practice, it is a process shaped by how quickly problems are recognized, how clearly decisions are made and how reliably systems support follow-through.

The two-clock model makes that process visible. One clock measures how long it takes to decide, and the other measures how long it takes to act. Both matter, but in many cases, it is the first clock that ultimately determines the outcome.

For veterinarians, the opportunity is to influence both. Because in the end, the difference between a good outcome and a poor one is rarely about knowing what to do, and far more often about whether the system supports doing it at the right time.

Spring Pasture Growth Raises Grass Tetany Risk in Beef Herds

Tue, 24 Mar 2026 17:07:12 GMT

As spring moisture and fluctuating temperatures drive a surge in forage growth, conditions are aligning for an increase in grass tetany risk across many beef operations. The same environmental shifts that are jumpstarting wheat pasture and other small grains can also create the mineral imbalances that trigger sudden losses in lactating cows.

With rapid pasture growth underway in many areas, grass tetany risk is rising in susceptible herds, according to Paul Beck, Extension specialist for beef nutrition with Oklahoma State University. High-quality forage is often directed toward cows with the greatest nutritional demands, placing early-lactation animals directly into higher-risk environments.

Fertility and Forage Growth Driving the Issue

Cool-season annuals are a valuable resource, particularly when they reduce reliance on hay and supplemental feed. But as pasture quality improves, mineral balance can shift in ways that are not immediately visible.

“Our best managed cool-season annual pastures have had adequate fertilizer high in nitrogen and potassium, both of which are necessary for grass growth. But high nitrogen and high potassium interacts with the marginal magnesium level in these forages and create issues with beef cows as they begin lactating,” Beck says.

Nitrogen and potassium fertilization support aggressive forage growth, particularly during periods of favorable moisture. At the same time, they can interfere with magnesium uptake, leaving cows vulnerable even when forage appears nutritionally rich.

Magnesium absorption occurs primarily in the rumen and can be impaired by high potassium levels, which reduce transport across the rumen epithelium. This is why fertilized, rapidly growing forages create a consistent risk pattern.

Periods of rain followed by rapid pasture growth can further amplify the risk, especially when cattle are transitioned quickly onto highly digestible forage.

Early Signs Easy to Miss as Cases Develop Quickly

Grass tetany remains a neurologic condition driven by low blood magnesium, and clinical signs can escalate rapidly once levels fall.

“Cows will start shaking and have uncontrolled muscle movements. They will lose their balance. That will be one of the first signs you see,” Beck says.

In the early stages, affected cattle may appear nervous or uncoordinated. As the condition advances, animals can go down and become unable to rise, with death occurring shortly after if intervention is not successful.

Because of this rapid progression, cases are often first recognized only after severe signs appear.

Early treatment with intravenous or subcutaneous calcium-magnesium solutions can be effective, particularly before animals become recumbent. Relapses are possible, and animals should be monitored closely following initial treatment.

Grass tetany should be differentiated from other causes of neurologic signs and sudden death, including hypocalcemia, polioencephalomalacia, and lead toxicity. History, pasture conditions and response to magnesium therapy can help support a presumptive diagnosis in the field.

Prevention Hinges on Timing, Not Reaction

Despite the speed at which grass tetany can develop, the risk itself is highly predictable. That makes prevention the most effective strategy, particularly during periods of rapid pasture growth.

“The best way to counter the problem is to act before we get to it,” Beck says.

That means preparing ahead of turnout, not reacting after symptoms appear. In practical terms, that looks like identifying high-risk pastures and production stages in advance, then ensuring supplementation is in place before cattle enter those environments.

This is especially important during spring transitions, when forage conditions can change quickly over a short period of time.

Mineral Intake Remains the Weak Link

While most producers are aware of the need for high-magnesium mineral, consistent intake remains the primary challenge.

“Magnesium oxide does decrease the palatability of mineral mixes, making it important to manage the feeding of these minerals,” Beck says.

Magnesium oxide is widely used due to its availability and cost-effectiveness, but reduced palatability can limit voluntary intake. Without active management, even well-designed mineral programs may fall short.

Management Focus as Risk Window Opens

With pasture conditions improving and turnout underway or imminent in many areas, attention is shifting toward practical prevention.

Risk mitigation should focus on:

Ensuring high-magnesium mineral is available before and during turnout.
Monitoring intake closely, rather than assuming consumption.
Placing feeders in high-traffic areas to encourage consistent use.

A Seasonal Risk That Follows Predictable Patterns

Grass tetany tends to emerge when rapidly growing forage, high-producing cows and inadequate magnesium intake intersect. Spring conditions consistently bring those factors together, making this a predictable — yet preventable — challenge.

Outbreaks often affect multiple animals within a short timeframe, particularly when herd-level mineral intake is inconsistent. This makes grass tetany both an individual animal emergency and a herd management issue.

Timely supplementation and close management of intake can help you stay ahead of the problem before clinical cases begin to appear.

Preweaning Performance Data Emerges for Beef-on-Dairy Calves

Mon, 23 Mar 2026 17:18:21 GMT

Preweaning performance shapes everything that follows, but for beef-on-dairy calves, investigation into that early-life picture has been sparse. While crossbreeding has been evaluated extensively in the feedlot, data from the first weeks of life has lagged behind. A new Journal of Dairy Science study from the University of Guelph helps close that gap, observing the early life performance of crossbred calves compared to Holsteins.

Key findings from the study include:

Crossbred calves demonstrated comparable or improved preweaning growth.
Health outcomes, including morbidity and mortality, were similar between groups.
Crossbred calves had reduced incidence of diarrhea and required fewer respiratory disease retreatments.
No additional management complexity was identified for crossbred calves.

Growth Performance Signals Early Advantages

Crossbred calves showed comparable or improved growth during the preweaning period. Crossbred calves had increased body weights by day 28, and weighed ~7 kg more than Holstein calves by day 84. This is consistent with what would be expected from heterosis, particularly for traits like growth efficiency and robustness.

That shift is notable because most of the economic rationale for crossbreeding has focused on downstream performance. This work suggests those advantages may begin earlier than previously documented.

This pattern is not isolated. In a controlled study of Angus × Holstein calves, crossbreds gained about 0.14 kg/day more than Holsteins and reached higher weaning weights under the same management conditions. Additional work reports similar trends, reinforcing performance differences can emerge during the preweaning period rather than later in production.

From a clinical standpoint, early growth is also a useful indicator of how well calves are handling nutrition, colostrum management and disease pressure. On that front, crossbred calves appear to perform at least as well as Holsteins under typical conditions.

Health Outcomes Show Targeted Advantages

Overall morbidity and mortality were similar between groups; however, important differences emerged in specific disease outcomes. Holstein calves had a higher incidence of diarrhea and were more likely to require repeat treatments for respiratory disease compared with crossbred calves. This pattern suggests that while total disease occurrence was similar, crossbred calves experienced fewer or less persistent clinical events.

These findings do not indicate a need for different protocols, but they do suggest crossbred calves may be less likely to require repeated intervention once disease occurs. This has potential implications for labor and antimicrobial use.

Measures of passive transfer, including serum total protein, were similar between groups, indicating these differences were not driven by variation in colostrum management.

Implications for Veterinary Practice and Calf Value

As beef-on-dairy crossbreeding becomes more common, veterinarians are increasingly involved in guiding how these programs are implemented and evaluated. The growing body of preweaning data provides a more complete foundation for those discussions.

Key implications include:

Crossbred calves can be integrated into existing calf-rearing programs without added health risk
Growth advantages may begin during the preweaning period, not just later in life
Standard health and nutrition protocols remain appropriate across genetic groups
Management fundamentals continue to have the greatest influence on outcomes
Early-life performance should be considered part of the overall value equation in beef-on-dairy systems

Taken together, the evidence points in a consistent direction: beef-on-dairy calves perform as well as, if not better than, Holsteins early in life, without added health risk. As more data emerges, that consistency strengthens confidence these calves can be managed within standard systems while delivering comparable or improved early-life performance.

Tips for Managing Hospital, Chronic and Rail Pens in Beef Feedlots

Fri, 20 Mar 2026 14:43:53 GMT

Special pens are designed to improve outcomes. But in many feedlots, they quietly become a source of drag on both health and performance.

“There’s a lot of philosophy around special pens, and not a lot of science,” says Dr. Brian Warr, veterinarian with TELUS Agriculture. “But the goal is to have as few animals as possible in each pen. We’re trying to keep it a truly special place, somewhere cattle can go and get better.”

In practice, that is not always what happens. Over time, hospital, chronic and rail pens can evolve into a catch-all for anything that does not fit elsewhere. Lame cattle, poor doers, repeat pulls and animals with unclear diagnoses accumulate in the same space. The result is not just inefficiency, it is a loss of structure.

“I see special pens that are like my top dresser drawer, you open it up and it’s just everything I don’t know what to do with,” Warr says. “In my book, if it’s in there, it should have a reason.”

To reclaim efficiency, we must stop viewing these pens as waiting rooms and start seeing them as active decision points. Every hour an animal spends in a special pen should move it toward a defined outcome:

Recovery (Return to home pen)
Reclassification (Move to chronic/salvage)
Euthanasia (Welfare intervention)

By shifting the mindset from storage to movement, veterinarians can turn a source of drag back into a high-performance tool for health.

Start with One Principle: Treat and Go Home

“We treat the animal and then the question becomes, now what?” Warr says. “The philosophy that’s come out of this is ‘treat and go home.’ Once they’re treated, we send them back to their home pen whenever we can.”

This approach challenges a long-standing instinct in feedlot management, which is to hold cattle back for observation after treatment. While that instinct is well intentioned, it often overlooks how strongly the environment influences recovery.

The home pen offers familiarity. Cattle return to known pen mates, an established social hierarchy and consistent access to feed and water. It also helps avoid disruptions in diet, which can be important in high-energy finishing systems.

By contrast, moving cattle into a shared hospital environment introduces what Warr describes as the “hospital effect.”

“When we put all the sick cattle in one place, we’re increasing infectious disease pressure,” he says. “We’re also introducing stress. It’s a new environment, they don’t know where the feed or water is, and the social order has to reset.”

Those stressors influence intake, behavior and immune function in ways that can counteract treatment.

Warr’s field experience comparing treatment protocols has supported this idea. Cattle treated with the same antimicrobial performed better when returned to their home pen than when held in a hospital pen.

This does not mean special pens are unnecessary, but it does mean they should be used selectively, not routinely.

Define the Role of Each Pen

Clarity in special pen management starts with defining what each pen is actually for, and just as importantly, what it is not for.

1. Treatment (Hospital) Pen

The treatment pen is intended for cattle that require active, short-term management. These are animals that need to be brought back through the chute for multiple days of therapy or require close observation due to the severity of their condition.

In many operations, this pen also becomes a holding area for cattle that are “too something”: too sick, too lame or too light to return to their home group. That can be appropriate, but it should be intentional.

The priority is maintaining flow. Every animal in the treatment pen should be moving toward a defined outcome. Some will complete therapy and return to the home pen. Others may transition into the chronic group. A small number may require euthanasia.

2. Chronic Pen

The chronic pen is where management discipline becomes most important — and where it often breaks down.

“When you walk into a chronic pen, you’re looking at the worst cattle in the whole feedlot,” Warr says. “It can feel defeating. But these are a small percentage of the total population, and we need to manage them deliberately instead of losing track of them.”

Without structure, that is exactly what happens.

“The big thing is don’t let it turn into an ‘I don’t know’ pen,” he adds. “If you don’t have a system, cattle just stay there and no one knows where they came from or where they’re going.”

Introducing a simple evaluation system can restore clarity.

“If I walk into that pen today, I might not know if that animal is getting better or worse,” Warr says. “But if I have a weekly data point, like weight, I can make that decision.”

That combination of objective and subjective assessment allows for more consistent decisions. Cattle can return to the home pen if they are improving and able to compete. Others may move to salvage if they are unlikely to finish. Some will require intervention from a welfare standpoint.

3. Rail Pen

The rail pen represents an endpoint in the system, but it still requires active management.

Tracking these outcomes clearly provides feedback on earlier treatment and management decisions. Without that information, it is difficult to evaluate how protocols are performing over time.

From a practical standpoint, this pen requires attention to withdrawal times, fitness for transport and clear entry criteria. These decisions often involve both economic and welfare considerations, so consistency is important.

4. Buller (Rider) Pen

The buller pen is designed to address mounting behavior, but it should remain temporary.

“We’ll give those cattle a cool-down period and then try to send them back,” Warr says. “About a third may come back again, but two-thirds will stay. If we don’t try, we just end up building bigger and bigger buller pens.”

Holding cattle too long in these pens can recreate the same social pressure that caused the issue in the first place. Reintroduction should be the default approach whenever possible.

Redefine the System: From Performance Drags to Biocontainment

The failure of a special pen is rarely complex. It is usually the result of overcrowding, poor footing and inconsistent management. These persistent issues don’t just slow recovery, they can actively create new health crises.

Beyond physical stressors, feeding strategy remains one of the most common blind spots in special pen management.

“When cattle go from a lower-energy hospital ration back to a higher-energy home ration, we can create acidosis,” Warr warns. “The clinical signs can look like a BRD relapse, and then we end up treating something that wasn’t BRD at all.”

This metabolic whiplash can lead additional losses that are difficult to explain on a necropsy report.

Correcting these nutritional gaps is the first step, but the larger opportunity lies in shifting toward a culture of biocontainment. While perfect biosecurity is often an unreachable goal in a feedlot, practical biocontainment — limiting the spread within the yard — is achievable. This shift opens the door to high-impact operational changes: adjusting treatment orders, separating high-risk cases and planning ahead for disease events. In high-performing facilities, this is simply part of the culture: the last animal isn’t out of the chute before the crew is already cleaning the alley.

The Bottom Line

Special pens should improve outcomes, not concentrate problems. For veterinarians and managers, the opportunity is in creating clarity: define the purpose of each pen, set clear movement criteria and build systems crews can follow consistently.

In the end, the goal is to use special pens deliberately — and as little as possible.

Mystery Respiratory Virus in Texas Panhandle Feedlots Is Fake News

Tue, 17 Mar 2026 16:10:35 GMT

Tuesday morning, false information about a mystery respiratory virus in Texas Panhandle feedlots was circulating online. According to the Texas Animal Health Commission (TAHC) and Texas Cattle Feeders Association (TCFA), these claims are false.

Dr. Bud Dinges, TAHC executive director and Texas state veterinarian, says, “Texas animal health officials have confirmed with Amarillo region staff and partners at USDA Animal Plant and Health Inspection, Texas A&M Veterinary Medical Diagnostic Laboratory and Texas Cattle Feeders Association that no reports of cattle with an ‘unknown’ respiratory virus in the Texas Panhandle have been received and no regulatory action is being taken at this time.”

National Cattlemen’s Beef Association CEO Colin Woodall addressed the rumors issuing a strongly worded release:

“Spreading unverified information like this is not only irresponsible, it is harmful to cattle producers, the beef supply chain and consumer confidence in a safe and wholesome product. Our industry depends on transparency, science-based animal health protocols, and strong collaboration with state and federal animal health authorities. We encourage everyone — producers, media and the public — to rely on credible sources and verified information. NCBA and state affiliate partners will continue working closely with animal health officials to monitor any legitimate concerns and ensure the continued health of the U.S. cattle herd.”

Serum Total Protein as a Benchmark for Calf Program Performance

Mon, 16 Mar 2026 15:34:29 GMT

Serum total protein (STP) testing has a relatively straightforward purpose in calf medicine: determining whether newborn calves successfully absorbed antibodies from colostrum.

But according to Bethany Dado-Senn, calf and heifer technical specialist with Vita Plus Corp, the metric is increasingly being used in a broader way. Rather than evaluating passive transfer in individual calves alone, many dairies now track STP results across groups of calves to assess how well their maternity and colostrum programs are working.

Few management decisions influence calf health more than what happens in the first hours after birth. Because STP reflects those early management decisions, it can provide rapid feedback about how well a calf program is functioning.

Why Serum Total Protein Matters

Serum total protein provides a practical proxy for immunoglobulin absorption after colostrum feeding. If calves receive adequate high-quality colostrum shortly after birth, STP values typically fall into higher ranges. If colostrum management is inconsistent or delayed, STP levels tend to drop.

The test is inexpensive and easy to perform using a refractometer, which has made it one of the most widely used field tools for evaluating passive transfer.

Research shows STP and passive transfer status is closely linked to calf health. In a large cohort study of over 4,000 calves, passive transfer status was associated with differences in disease incidence, mortality risk and early growth performance.

Calves with higher STP concentrations experienced fewer health events during the preweaning period compared with calves in lower passive transfer categories. These findings suggest STP reflects more than antibody transfer alone. It may also capture the combined effects of colostrum quality, feeding timing and early calf care.

These relationships have led veterinarians to view STP as an early indicator of overall calf program success.

Understanding STP Benchmarks

Modern passive transfer benchmarks are largely based on research evaluating thousands of dairy calves. The Dairy Calf and Heifer Association classification system divides calves into four categories based on serum total protein levels.

Passive Transfer Category	Serum Total Protein
Poor	<5.1 g/dL
Fair	5.1–5.7 g/dL
Good	5.8–6.1 g/dL
Excellent	≥6.2 g/dL

Strong colostrum programs typically achieve:

At least 40% of calves in the “excellent” category
Fewer than 10% in the “poor” category

“Calves in that poor category have a four times increase in mortality risk and about a one and a half times increased risk of bovine respiratory disease and scours,” Dado-Senn says.

Tracking these proportions over time helps farms monitor the consistency of colostrum management.

Serum protein concentrations gradually decline as calves age. For that reason, sample calves between 2 and 4 days of age whenever possible. Maintaining a consistent sampling protocol is especially important when STP is used as a herd-level benchmark.

From Diagnostic Test to Management Benchmark

Rather than focusing only on individual calves, many dairy operations now track herd-level STP results over time. Some farms monitor average STP values by month or quarter, while others track the percentage of calves falling into different passive transfer categories.

In some cases, the metric is even used as a management tool to encourage employee performance.

“There are a number of dairies that I work with that utilize things like serum total proteins or average daily gains of their calves as kind of a performance benchmark for their staff. There might be a list on the door saying, ‘Hey, here’s our serum total protein goal. Here’s where everybody is relative to that,’” Dado-Senn says.

Using STP this way creates a direct feedback loop between colostrum management and measurable outcomes. When calf-care teams can see how their practices translate into herd metrics, it becomes easier to identify where protocols are working and where adjustments may be needed.

Tracking STP Trends Over Time

Evaluating STP results as trends rather than isolated measurements can be helpful for evaluating broader systems. Monitoring herd averages and passive transfer categories over time can reveal subtle changes in colostrum management before clinical problems appear.

In herds with strong maternity protocols, STP trends can remain consistently high. Dado-Senn describes one dairy client who tracks STP trends on a quarterly basis.

“Looking at serum total protein trends over quarters, they do an absolutely fantastic job. Their averages are well-above the excellent range and they typically don’t have much more than 1% or 2% in the poor category,” Dado-Senn says.

Tracking results this way gives farms a broader evaluation of calf program performance, allowing them to make system-wide improvements.

Detect Management Problems Early

Because STP reflects events that occur immediately after birth, shifts in herd averages can reveal management issues before disease outbreaks occur.

Declining STP values may signal:

delayed colostrum feeding
lower colostrum quality
changes in maternity staffing
inconsistent colostrum handling protocols

Spot testing calves periodically can identify these problems quickly.

A Simple Test with Growing Influence

Calf programs involve many moving parts, from maternity management to housing and nutrition. Yet the earliest decisions in a calf’s life often have the greatest impact. Serum total protein testing provides a simple way to measure the success of those decisions.

What began as a diagnostic test for passive transfer is increasingly becoming something more: a practical performance indicator for the entire calf system.

How is Artificial Intelligence Enhancing Cattle Health Monitoring?

Fri, 13 Mar 2026 13:56:59 GMT

Artificial intelligence (AI) has made its way into agriculture in various ways, providing new technologies to enhance production agriculture. At the University of Arkansas, researchers developed a tool, the CattleFever system , that uses AI and thermal and RGB color cameras to detect cattle body temperature.

Traditionally, cattle temperatures are taken rectally. With the CattleFever system, this can reduce labor required to track herd health. Temperature is a key symptom for many diseases, so this system allows for faster detection and treatment.

Research Background

The University of Arkansas is equipped with an Artificial Intelligence and Computer Vision Lab, directed by Ngan Le, associate professor in the department of electrical engineering and computer science. She explains one of her key research directions is precision agriculture with artificial intelligence and computer vision.

Previous projects have focused on poultry, but broader agriculture-related projects, including cattle welfare, are on the horizon.

Le says, “This motivation led me to initiate collaborations with colleagues in the department of animal science, including Dr. Kegley, Dr. Powell and Dr. Zhao to combine their expertise in cattle with our strengths in AI and computer vision.”

This project initiative was closely supported and funded by the University of Arkansas division of agriculture.

Platform Construction

To build CattleFever, researchers needed data. However, the existing data for cattle only provided overhead rather than thermal images. So, the group built their own dataset using thermal images of calves. Collaborating with the Savoy Research Complex at the university, calves were recorded with synchronized RGB cameras, technology that captures images with red, green and blue light, and thermal cameras.

Rectal temperatures were also recorded for a base in the dataset. Technical team members, Trong Thang Pham and Ethan Coffman, along with several undergraduate students developed a semi-automated annotation and data processing system. More than 600 recorded frames were used to train the system in what to look for. This data all served as a benchmark for the CattleFever system.

All images gathered were linked to thermal and RGB images. Landmarks in 13 different places, such as eyes, ears, muzzle and mouth, on the animal were established.

“These landmarks allow the system to localize individual facial regions, and the thermal camera then measures the temperatures in those regions,” Le says.

The eyes and nostrils read closest to the rectal temperatures, so these landmarks were established as focus areas for thermal image readings. A machine-learning approach was used to predict data results.

These technology trainings resulted in CattleFever being able to automatically detect animal temperature within 1 degree of the rectal reading. Le explains that as more data is collected in real-life environments, the more accurate the system will become.

Project Outlook

In these studies, all cattle were directly facing the thermal cameras.

“‘We probably need to take more photos of them in the real-world settings, such as running around, to capture their motion in the field,” Pham explains.

Teaching the cameras how to recognize and interpret a cow’s face in real-world environments is the next step. Le explains further features like environmental and audio sensors will be added to increase animal welfare monitoring accuracy and lead to more developments of indicators like common symptoms or early signs of illness. At this point, additional funding is being sought to continue more research on this project.

Eventually, the goal is for producers to have access to technology like this. This could look like a monitoring system of cameras set up that are synched to a mobile interface or app.

Le says, “While the current work represents an important first step, we are excited about continuing to develop technologies and expanding its capabilities to support the real-world agricultural applications.”

The Top Three Biggest Mistakes When Using Crowd Gates

Tue, 11 Mar 2025 17:47:51 GMT

Crowd gates are often one of the most used tools on a dairy. Not only do they save significant time for employees, but they also help reduce the stress associated with moving cows.

However, just like any tool, crowd gates can be used incorrectly and can sometimes negatively impact cow comfort and welfare. Carolina Pinzon, a Dairy Outreach Specialist with the University of Wisconsin-Madison, highlights the three most common mistakes she sees in crowd gate usage and provides practical strategies to avoid them.

Overcrowding the Holding Area

Occasionally, overcrowding the holding area happens, but Pinzon warns that prolonged overcrowding can negatively impact cow health, production, and welfare. This is especially concerning during summer when cows generate extra body heat and require sufficient airflow.

“Signs of an overcrowded holding pen include cows with their heads up, unable to plant their four feet on the ground, and looking restless and uncomfortable,” Pinzon says. “Short-term overcrowding can also result from misuse of the crowd gate, by employees pushing it too far forward and smashing the cows.”

To prevent overcrowding, Pinzon recommends balancing parlor and pen sizes, so cows spend no more than one hour away from their pens during each milking. Holding areas should allow at least 20 square feet per cow.

“If needed, a large pen can be divided into smaller groups,” Pinzon suggests. “While this means more trips to the parlor for workers, it significantly reduces the time cows spend in the holding pen. Additionally, short-term overcrowding can be alleviated by moving the crowd gate backward to provide more space for the cows.”

Being Careless

While dairy cows are typically gentle giants, they can be stubborn and slow to move. This, however, doesn’t justify using force. Moving crowd gates too quickly or applying electricity can cause unnecessary stress and fear for the animals.
Instead, Pinzon emphasizes the importance of calm and gentle handling. She advises guiding cows to the parlor without pressure or haste.

“Once the cows on one side of the parlor have exited, the crowd gate can be moved forward,” Pinzon says. “This regular adjustment is crucial to accommodate the changing number of animals and available space in the holding area. Automating crowd gates to move forward every time exit gates are open/lift can help reduce misuse.”

Pinzon recommends keeping crowd gates at least three feet from the cows to avoid pressing against their backs. She suggests using sound cues, like bells or ringing, to train cows to move forward, rather than relying solely on gate movement. If the gate gets too close, pull it back to give the cows more space before resuming forward movement. These practices promote a stress-free and productive environment for both cows and workers.

Workers Entering the Holding Area

Crowd gates are valuable tools for safely and efficiently moving cows toward the parlor entrance. However, when employees enter the holding pen to push cows, it can create unnecessary stress for the animals and put workers at risk of injury.

Pinzon highlights the importance of regularly training employees on proper cow handling and the correct use of crowd gates. She stresses avoiding the practice of entering the holding area to chase cows and instead maintaining a calm and consistent environment for the animals.

“Except for when loading the last cows of a pen and fresh cows, the door from the parlor pit to the holding area should remain closed during most of the milking process,” she adds. “This physical reminder is to discourage workers from entering the holding area. In addition, regular maintenance of crowd gates, prompt reporting of issues, and swift resolution of problems by management are crucial for proper gate function.”

Spotting these three common mistakes in crowd gate use and taking proactive steps to address them can significantly improve cow welfare, employee safety, and your herd’s operational efficiency. Regular maintenance, clear protocols, and proper training go a long way in preventing overcrowding and keeping things calm and stress-free for both cows and workers.

How Will U.S. Producers Maintain Business when New World Screwworm Invades?

Wed, 11 Mar 2026 19:59:32 GMT

With animal disease, prevention and preparation beat panic. Since New World screwworm (NWS) was last eradicated from the U.S. in the 1960s, the tools and infrastructure to deal with foreign animal disease have dramatically changed.

Dr. Justin Smith, Kansas animal health commissioner and state veterinarian, during the recent Kansas State University Cattlemen’s Day gave an update on how Kansas and other states are preparing for NWS. The approach is designed to keep producers in business, keep cattle and products moving, and manage NWS in a way that protects both herds and markets.

He says the U.S. animal health officials along with USDA are planning a multistate, coordinated response that aims for consistency across state borders.

Smith summarizes the industry’s preparation to tackle NWS is like a three-legged stool. U.S. producers will be able to maintain business when NWS invades through surveillance, treatment and movement controls.

Surveillance: Eyes on Animals

The first leg of the stool is surveillance. He stresses early detection depends heavily on producers and veterinarians watching animals closely and reporting anything suspicious.

Smith emphasizes they would rather over investigate than miss a case.

“We want to make sure that we err on the side of having to say no on many occasions, versus saying, ‘Yep, this is what we got.’ Eyes on animals is going to be key.”

He was clear this should feel like partnership, not policing.

“They don’t want it to look like Big Brother coming over your shoulder,” he explains. “I hope we want to get this thing quickly.”

Smith explains that once a positive premises is identified, surveillance becomes structured around zones. The infested premises sit at the center, surrounded by an infested zone, an adjacent surveillance zone and a broader fly surveillance area.

The infested zone is 12.4 miles in radius from the infested premises. In this zone, there will be frequent on‑animal checks for wounds and larvae, plus enhanced monitoring in surrounding zones using fly traps and animal observation. The adjacent surveillance zone is another 12.4 miles radius and then there will be a fly surveillance area — an 124-mile radius from the infested premises.

Smith says movements out of the infested zone will require visual inspection for wounds and systemic treatment, including a treatment window of three to 14 days before movement plus a documented certificate of veterinary inspection.

He says the current Kansas response plan aligns with USDA’s playbook and neighboring states’ plans while taking into account specific needs of the Kansas livestock industry.

He stresses the playbook will continue to evolve, and state-by-state implementation may vary, but he says the “zone approach” will be utilized by all states.

Treatment: Limited Tools, Use Strategically

The second leg is treatment. Smith says that after decades without large domestic outbreaks, labeled options are limited.

From the fact that we haven’t had this new tool in our nation, in a large-spread outbreak since the 60s, we don’t have a lot of treatments out there that are labeled for this organism.”

To date, the Food and Drug Administration (FDA) has approved four products for large animals:

He cautions, “The goal is not to go out there and just habitually treat your animals just in case. We want to make sure that we’re utilizing these [products] responsibly. There’s not an unlimited supply out there, and so we want to make sure that it’s available for us when we do need it.”

On a positive premises, Smith says treatment will be mandatory and systematic.

“There will be a quarantine placed on that premises. We’re also going to require a certain level of treatment on that premises,” he explains.

There will be protocols for daily mortality disposal, so carcasses don’t become breeding sites.

“The last thing you want to do is bury an animal that has larvae and has the ability to advance.”

He says treatment is also tied to movement out of infested zones, with most animals needing prophylactic treatment before leaving.

Movement Controls: Targeted, Not Statewide Shutdowns

The third leg is movement control, designed to be precise rather than broad-brush. Smith stresses NWS is an infestation, not an infection , emphasizing it is not a systemic disease problem, but an infestation that still demands strong controls.

He says there will be movement restrictions if a premises falls into an infested region. To move animals out of that zone, there will be steps to follow but movement will not be completely shut down.

He explains some exceptions exist:

Animals moving directly to slaughter can go without pre‑movement treatment, but those animals have to be hanging on the rail within 72 hours.
Baby dairy calves must be treated but can move right away if treatment and navel care are documented.

He says Kansas is also coordinating with neighboring states to create “synergistic” rules, especially for cattle from higher‑risk states such as Texas. Cattle entering Kansas from recognized infested zones will face inspection, treatment requirements and at least 14 days in drylot containment on arrival.

NWS is Not a Food Safety Issue

Smith reassures producers and consumers that NWS is not a meat safety threat.

“This is not a food safety issue,” he says. “If an animal is presented to slaughter, it has a screwworm wound then it has the ability to be trimmed. That carcass will not be condemned. There are no restrictions on any inspected product for food safety reasons.”

Smith summarizes underpinning all three legs is a commitment to dynamic planning and continuity. He notes a revised USDA playbook is forthcoming and that “plans will be a little bit dynamic” as they learn more.

The core message for producers is clear: watch your cattle, report early, use treatments wisely and expect targeted movement controls — not blanket shutdowns — if NWS crosses the border.

USDA Announces Sterile Fly Production Facility Construction Contract

USDA and U.S. Army Corps of Engineers (USACE) announced March 9 a construction contract with Mortenson Construction to build a new sterile fly production facility at Moore Air Base in Edinburg, Texas.

This facility is a key component in U.S. Secretary of Agriculture Brooke Rollins’ sweeping 5-prong strategy to fight NWS. USACE is partnering with USDA and will provide oversight for the contract, design, engineering and construction of the facility.

“The Army Corps of Engineers is an essential partner in bringing this facility to life and further highlights the Trump Administration’s government-wide effort to fight the New World Screwworm threat in Mexico,” Rollins says. “The Army Corps is the best in the business and their engineering expertise and proven track record in delivering complex projects will help ensure we can build a modern, resilient facility that protects American agriculture from invasive pests for decades to come. This first-of-its-kind facility on U.S. soil will ensure we are not reliant on other countries for sterile flies.”

A sterile fly production facility is a specialized biosecure complex where NWS flies are raised and sterilized using irradiation and then released into targeted areas.

USDA currently produces about 100 million sterile flies per week at the COPEG facility in Panama and disperses them within and just north of affected areas in Mexico. In addition to the COPEG facility in Panama, USDA invested $21 million to support Mexico’s renovation of an existing fruit fly facility in Metapa , which will double NWS production capacity once complete.

With ongoing support from APHIS technical experts, Mexico anticipates sterile fly production will begin at this facility in summer 2026. The new facility at Moore Air Base will be the only U.S.-based sterile fly production facility and will work in tandem with facilities in Panama and Mexico to help eradicate the pest and protect American agriculture.

USDA and USACE will break ground on this new facility later this spring, after initial planning and development meetings with the new contractor. By November 2027, the production facility at Moore Air Base is expected to reach its initial goal of producing 100 million sterile flies per week. After that, construction will continue at the facility to increase production with the long-term goal of producing 300 million sterile flies per week.

Compounded Drugs in Livestock: Regulations, Uses and Benefits

Fri, 13 Mar 2026 14:25:20 GMT

“Compounding pharmaceuticals are drugs that we start with an approved drug in livestock and poultry,” says Dr. Brian Payne, veterinarian and director of research and development and technical services for Veterinary Pharmaceutical Solutions on a recent episode of DocTalk . “We change the format of it so that it’s more applicable to the livestock species.”

In livestock medicine, you may face situations where no labeled drug exists for a specific species, condition or route of administration. In those cases, compounded drugs may provide an alternative by adapting approved medications into formulations better suited for food animal production systems.

Why Compounded Drugs Are Used in Livestock Medicine

One reason compounding plays a role in food animal medicine is the limited number of pharmaceuticals developed specifically for livestock species.

“There’s a limited amount of resources being spent on livestock today on new pharmaceuticals,” Payne says. “But there’s a lot of really good pharmaceuticals out there that veterinarians want to use for livestock. If we can take those active ingredients from FDA-approved products and get them into the right format, you have a whole other tool for your producers.”

Rather than creating entirely new drugs, compounding allows veterinarians and pharmacists to modify existing FDA-approved medications into formats better suited for livestock production.

How Compounded Drugs Improve Drug Delivery

One advantage of compounding is the ability to create alternative delivery methods that may better fit livestock production systems.

Many treatments traditionally require injections or running cattle through a chute, which can increase labor and stress for animals and handlers. Compounded formulations may allow treatments to be delivered through oral suspensions or drinking water systems when appropriate.

“If you’re putting it through the water, it can minimize handling, which is always a positive,” Payne says. “And also if you need to choose a drug that’s different, now you have the ability to administer it that way.”

Alternative delivery routes may also allow veterinarians to select drugs with different pharmacologic profiles when needed.

“It gives you the ability to choose a drug that’s different and administer it in a way that works for the operation,” Payne says.

Veterinary Regulations for Compounded Drugs

Despite some misconceptions, compounded drugs used in livestock are subject to regulatory oversight.

“We always have to start with an FDA-approved product,” Payne says. “Once we start manipulating or compounding those drugs, we have to follow procedures to make sure that’s cleanly done.”

Compounding itself can be performed either by a veterinarian or a pharmacist.

“Once a veterinarian gets their license, they have the full ability to compound themselves or a pharmacist can compound,” Payne explains. “A producer can’t compound on their own.”

A decision framework from the Animal Medicinal Drug Use Clarification Act and FDA guidance that prioritizes approved treatments before considering compounded options should be followed:

Use an FDA-approved drug for the species, condition and route of administration when available.
Consider extra-label use of an approved product when appropriate.
Use compounded formulations when no approved option meets the clinical need.
Ensure the compounded drug begins with an FDA-approved product.
Establish appropriate withdrawal intervals to prevent residues.

Withdrawal Times and Quality Control

Residue avoidance remains a critical responsibility when using compounded drugs in food animals.

“There’s zero tolerance for any residues in compounded products, and we have to keep that in mind,” Payne says. “It’s the responsibility of the veterinarian to prescribe that with a withdrawal period.”

Withdrawal intervals may be determined using pharmacokinetic information, including drug half-life and available research data, to estimate when residues are no longer present in the animal.

Quality control is another important component of pharmaceutical compounding. Compounding pharmacies may test compounded batches to ensure the drug concentration matches the intended formulation.

“We want to check to understand if the potency we say is in there is actually in there,” Payne says.

Compounded Drugs as an Additional Tool for Livestock Veterinarians

Compounded drugs are not intended to replace approved pharmaceuticals. Instead, they provide another option when labeled products are unavailable or impractical for a particular situation.

For veterinarians managing herd health across diverse livestock systems, that flexibility can be valuable.

“It gives you another set of tools to utilize,” Payne says.