ANSC Feeds Practice Exam 2025 - Free Practice Questions and Study Guide

The energy content of animal feeds is primarily determined by the composition of carbohydrates, fats, and proteins. These macronutrients play critical roles in providing energy. Carbohydrates are the primary energy source for animals, as they can be quickly metabolized to provide fuel. Fats, on the other hand, are energy-dense nutrients, containing more than twice the energy per gram compared to carbohydrates and proteins, making them vital for higher energy needs. Proteins, while primarily known for their role in growth and repair, can also serve as an energy source, especially when the intake of carbohydrates and fats is insufficient.

The presence of vitamins and minerals, while essential for overall health and metabolic processes, does not contribute directly to the energy content of feeds. Processing methods may affect the digestibility and availability of these nutrients but do not change the basic energy contribution from carbohydrates, fats, and proteins. Similarly, the moisture level of the feed is important for storage and handling, as excess moisture can lead to spoilage and decreased feed quality, but it does not inherently alter the intrinsic energy value provided by the feed's macronutrient composition. Thus, the correct option highlights the fundamental components of the feed that directly provide energy to the animals.