ANSC Feeds Practice Exam

What factors influence the net energy requirements for growth in beef cattle?

1. Feed quality and temperature

2. Body weight, activity, breed

3. Cost of feed and availability

4. Weather conditions and pasture type

The correct answer is: Body weight, activity, breed

The net energy requirements for growth in beef cattle are significantly influenced by several physiological and environmental factors. Body weight is a crucial factor because as cattle grow, their energy needs increase to support not only their existing body mass but also the development of new tissues. Heavier animals require more energy to maintain their bodily functions and grow effectively. Activity level also plays a role in energy requirements. Cattle that are more active, whether due to grazing patterns or behavioral tendencies, will expend more energy and thus require higher net energy intake to meet their growth needs. Breed differences can also influence energy requirements as some breeds may have higher genetic potential for growth and may metabolize energy differently. For example, certain beef cattle breeds are known for their efficient growth rates and feed conversion efficiencies, which would affect their overall energy needs. These aspects interact closely to define the amount of net energy needed for optimal growth, making them primary determinants of energy requirements for beef cattle. In contrast, while feed quality, weather conditions, and pasture types may impact overall animal health and productivity, they do not directly influence the foundational net energy requirements for growth to the same extent as body weight, activity, and breed do.