Optimizing winter feeding
The power of the limit-fed precision energy diet
By Ana Clara B. Menezes and Megan A. Wehrbein
Winter feed costs typically represent the largest portion of a cow/calf operation's expenses. In times of limited hay supply and increased hay price, it can be economically advantageous to use corn rather than traditional hay to meet the energy and protein requirements of pregnant cows.
Replacing high-forage hay with corn and corn byproducts, such as dry rolled corn and distillers grains, offers a readily available source of supplemental energy and protein. This alternative provides a lower cost per unit of energy than relying heavily on hay.
The strategy: Targeted, low-waste feedingOur research team recently completed a trial testing a novel approach: limit feeding a high-concentrate, corn-based diet in a dry-lot setting as a cost-effective method for meeting the nutrient requirements of beef cows during late gestation and early lactation.
We are proposing this concept as the Limit-Fed Precision Energy Diet—a targeted nutritional delivery system, not a free-choice grain ration. This is a limit-fed system designed for maximum energy density and zero waste, minimizing the risk of overconsumption and acidosis while ensuring every nutrient is utilized for cow health and calf development.
Beyond the feeding period, this strategy can also help operations optimize land utilization by extending dry-lot feeding, which in turn spares pasture and enhances pasture growth and resilience later in the spring.
Key findings to watch forOur research compared this limit-fed corn-based diet (HCON) against a traditional ad-libitum high-forage, hay-based diet (HFOR). The findings suggest this alternative winter-feeding strategy offers several major advantages for producers:
Significant cost reductionThe limit-fed, high-concentrate diet successfully met the cows' nutrient requirements while resulting in substantial overall savings per head compared to the traditional hay-based diet.
Enhanced calf nutritionCows on the limit-fed corn diet showed similar or improved lactation parameters.
Colostrum yield was increased in the cows fed the corn-based diet, while the composition and concentration of crucial immunoglobulins (IgG, IgM, and IgA) remained similar to those fed the hay diet.
This physiological difference suggests the corn diet may provide more energy for the calf without detrimentally affecting the essential passive immunity provided by the colostrum.
Milk yield and milk fat were increased in response to high concentrate diets.
Sustained calf growthDespite the limit-fed cows having a lower body weight during the feeding period, the body weight of their calves did not differ between the two treatments at any measured time point through weaning.
Environmental benefitThe limit-fed nutritional strategy has the potential to reduce feeding costs, improve feed efficiency, and reduce enteric methane production.
In fact, the enteric methane emissions were lower for cows on the corn-based diet throughout the study.
The full details on this optimized system—including specific cost comparisons, nutrient data, and comprehensive cow/calf performance metrics—will be available soon in our upcoming peer-reviewed manuscript. This research offers a promising alternative to beef producers looking to reduce feeding costs and improve cow and calf performance.
AcknowledgmentsFaculty, staff, graduate and undergraduate students of the Department of Animal Sciences, South Dakota State University (Brookings, SD); Department of Dairy and Food Science, South Dakota State University (Brookings, SD); Department of Animal Sciences, Auburn University (Auburn, AL); Division of Animal Sciences, University of Missouri (Colombia, MO). The authors would like to thank the Iowa Beef Industry Council for providing financial support for this research.
Menezes is an assistant professor of ruminant nutrition and Wehrbein is a graduate research assistant, both in the Department of Animal Science at South Dakota State University . Photos courtesy of Wehrbein.
