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By Kirsten Nickles, Graduate Research Associate and Anthony J. Parker, Associate Chair and Associate Professor. Department of Animal Sciences, Ohio State University
The nutritional requirements for beef cows change daily throughout their annual production cycle. The frequent change in requirements is caused by varying stages of production and environmental factors that affect the cow’s behavior and energy use. To give an example, a spring calving beef cow gestating throughout winter will have energy requirements for maintenance and gestation, and there may be further requirements for cold stress if winter climatic conditions place the cow outside her zone of thermal comfort. To appreciate how great the total net energy cost of a beef cow can be we have included the net energy requirements in Mcal/day throughout the annual production cycle of a mature 1,200-pound Angus cow with a peak milk yield (PMY) of 18 pounds. We included the requirements for maintenance, lactation, and gesta