Smoke from Canadian wildfires has blanketed much of the eastern United States this week, prompting air quality alerts across multiple states and raising questions for livestock producers. While healthy cattle are generally expected to tolerate short-term smoke exposure, poor air quality can add another layer of stress, particularly for calves, animals with respiratory disease and cattle already coping with summer heat.
Research on wildfire smoke is still emerging, but most recommendations focus on a common goal: reduce unnecessary stress until air quality improves.
This means making practical management decisions over the next several days rather than reacting to the smoke itself.
Five Steps to Take Today
When smoke settles over an area, small management changes can help reduce the overall burden on cattle. Extension specialists at Oregon State University suggest the following:
- Postpone stressful handling such as shipping, processing, weaning or vaccinations when practical.
- Provide unlimited access to clean, fresh water and continue heat-abatement practices like shade, fans or misters.
- Reduce dust around feed, pens and alleyways whenever possible.
- Monitor vulnerable animals closely, including calves, cattle being treated for respiratory disease and recently transported animals.
- Keep an eye on local Air Quality Index (AQI) reports and return to normal management once conditions improve.
Avoid Adding to the Stress Load
Smoke contains a mixture of gases and fine particulate matter produced during combustion. Of greatest concern is particulate matter smaller than 2.5 micrometers (PM2.5), which can travel deep into the lungs. Wildfire smoke also contains carbon monoxide, ozone, nitrogen dioxide and other combustion products that can contribute to respiratory irritation.
Most healthy cattle will likely recover from a few days of smoky conditions without lasting health effects. The greater concern is what happens when smoke is layered on top of other stressors.
Working cattle through the chute, hauling them long distances, weaning calves or transporting animals all increase respiratory demand. During periods of poor air quality, delaying those activities for a few days, when practical, can help reduce the overall physiological burden.
The U.S. Environmental Protection Agency similarly recommends postponing stressful procedures and minimizing exertion during wildfire smoke events, particularly when smoke is accompanied by hot weather.
Keep Cattle Cool and Hydrated
During the summer months, poor air quality often coincides with high temperatures, creating multiple environmental stressors at once.
It is recommended to maintain normal heat-abatement practices throughout smoke events. That includes providing shade, fans or misters where appropriate and ensuring cattle always have access to clean, fresh water. Well-hydrated respiratory tissues are less susceptible to irritation, making water availability especially important during smoky conditions.
Producers should also minimize dust whenever possible. Wetting high-traffic alleyways, reducing dusty feed conditions and avoiding activities that stir up dry soil can help limit additional respiratory irritation.
Pay Extra Attention to Vulnerable Animals
Not every animal will respond to smoke the same way.
Calves, cattle being treated for bovine respiratory disease, recently transported animals and dairy cows already experiencing heat stress deserve closer observation while air quality remains poor.
Clinical signs that warrant attention include:
- Increased respiratory rate
- Coughing
- Noisy or labored breathing
- Open-mouth breathing
- Nasal discharge
- Excessive tearing or eye irritation
- Fatigue or weakness
- Reduced feed intake
Note that cattle may still experience physiological stress from smoke even if they do not show obvious clinical signs, making close observation important during prolonged smoke events.
A Practical Approach until the Skies Clear
Wildfire smoke has become an increasingly common reality across North America, even for producers located hundreds or thousands of miles from the fires themselves. As smoke events become more frequent, veterinarians are likely to receive more questions about how to manage cattle during periods of poor air quality.
Fortunately, the recommendations remain straightforward. The best approach is to minimize avoidable stress, continue heat-abatement practices, reduce dust, provide plenty of clean water and monitor vulnerable animals until air quality improves.
For most healthy herds, a few smoky days are unlikely to create widespread health problems. A few simple management adjustments, however, can help ensure smoke remains a temporary inconvenience rather than a larger animal health issue.
