ANSC Feeds Practice Exam 2026 - Free Practice Questions and Study Guide

The dietary needs of animals vary significantly based on their age, and younger animals specifically have heightened requirements for certain nutrients. As they are in their growth phase, younger animals require more protein and energy to support their rapid development and to build muscle and tissue. Protein is essential for growth because it provides amino acids necessary for building new cells and repairing tissues. Similarly, energy is critical as younger animals are often more active and need this energy for overall growth, development, and activities.

In contrast, adult animals have different dietary needs as they are no longer growing. While they still require nutrients, their requirement for protein and energy is lower compared to that of younger animals. This distinction in nutrient needs highlights the importance of adjusting diets based on the developmental stage of the animal. Older animals may also have different needs, sometimes requiring diets that are more easily digestible and lower in calories, which is different from the nutrient-dense diets required by younger animals for optimal growth. Therefore, the correct choice emphasizes the heightened needs of younger animals for protein and energy as they grow.