New strategies to reduce the cost of production include more efficient nutrient use by the animals and improvements in their lifetime production efficiency. Instead of feeding more to pregnant and lactating cows that need additional nutrients during this period, Agricultural Research Service (ARS) scientists are trying to make the cows more efficient so they'll need less feed.
Beef producers spend a large portion of their budget on feed, which represents 50-55% of the total costs of developing replacement heifers. Animal scientist Andrew Roberts, geneticist Michael MacNeil and their colleagues at the ARS Fort Keogh Livestock and Range Research Laboratory (LARRL) in Miles City, Mont., have found that reducing the amount of feed given to heifers can result in more efficient use of nutrients for growth and reproduction.
Researchers studied two lifetime treatment groups composed of hybrid heifers that were 50% Red Angus, 25% Charolais and 25% Tarentaise. A control group was fed according to traditional industry recommendations, and a restricted group was fed 80% of feed consumed by their counterparts (calculated on a common body weight basis) for 140 days.
Heifers receiving less feed also gained weight more efficiently throughout the postweaning period and the following grazing season. The actual amount of feed provided to restricted heifers over the entire feeding period, which ended when animals were 1 year old, was about 73% of that given to the control group.
Strategy reduces replacement costs
Using this strategy to provide less feed might reduce costs of producing each pregnant replacement heifer by more than $31, Roberts says. The practice could also extend the animal's life, with important implications for lifetime efficiency and profitability.
In the experiment, restricted heifers had a final pregnancy rate of 87% and the control heifers had a 91% pregnancy rate, MacNeil says.
"Our results indicate that restricting feed is a matter of economics for farmers," he says. "We have also found that other strategies, such as crossbreeding and providing early calving assistance, can increase rebreeding performance of young cows."
Increasing efficiency through feed-restricted diets
Heifers were managed as one group from breeding through late fall, and pregnant animals were again separated into two groups—restricted feed and control—each winter. During winter months, restricted cows were fed 20% less supplemental feed than the control group.
Eventually, less-efficient heifers failed to reproduce and were culled if they were on a restricted diet. Increasing their feed would keep the cows in production but cost more for the producer, Roberts says. Inefficient breeders could be eliminated early to be harvested for high-quality meat.