ANSC Feeds Practice Exam

What nutrient requirement is critical for beef cows during breeding to weaning?

1. Protein intake

2. Calcium and phosphorus

3. NEm (Net Energy for Maintenance)

4. Fiber content

The correct answer is: NEm (Net Energy for Maintenance)

The correct choice highlights the importance of Net Energy for Maintenance (NEm) during the breeding to weaning phase for beef cows. NEm is an essential measurement that quantifies the energy needed to maintain the cow's body weight and health under typical circumstances. During the breeding to weaning period, cows are under significant physical stress due to reproduction and lactation. Adequate energy intake ensures that they can meet their metabolic needs, support fetal development, and produce milk for their calves. While protein intake, calcium, phosphorus, and fiber content are all important aspects of a cow's diet, the specific need for adequate energy, particularly in the form of NEm, during this time cannot be understated. A lack of sufficient energy can lead to poor body condition, reduced reproductive performance, and inadequate milk production, which ultimately affects calf growth and survival. Therefore, ensuring that beef cows have a sufficient energy supply is critical for the health of both the cow and her offspring during this critical growth and development stage.