ANSC Feeds Practice Exam

How do the protein requirements for a 300 lb small-frame steer gaining 3 lb per day compare to those of a large-frame steer of the same weight?

1. Higher for small-frame steer

2. Lower for small-frame steer

3. The same

4. Uncertain

The correct answer is: Higher for small-frame steer

The protein requirements for a small-frame steer typically differ from those of a large-frame steer due to variations in muscle composition, growth patterns, and overall body structure. Small-frame cattle generally have a higher percentage of body fat and lower muscle mass compared to large-frame steers. As a result, they often require a greater proportion of protein relative to their body weight to support efficient growth and muscle development. For a steer that is gaining weight, adequate protein is crucial for the synthesis of muscle tissue. Since small-frame steers are often less efficient in converting feed into muscle, they tend to require higher protein levels to meet their growth goals and ensure that they achieve the necessary lean tissue gain. This higher protein requirement is also influenced by the fact that small-frame animals usually have a greater need for protein relative to energy for optimal growth performance. In contrast, large-frame steers, which tend to grow faster and maintain a more favorable muscle-to-fat ratio, may not require as much protein to achieve the same weight gain. Their growth efficiency allows them to thrive with slightly lower protein intake when considering the same weight gain target. Thus, the protein requirements of a small-frame steer gaining at a similar rate will indeed be higher than those of a large-frame steer of the same