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

The correct answer is carbonaceous roughage, which refers to feed materials that are higher in carbon compared to other nutrients such as protein. Rice hulls fall into this category due to their high fiber content and low protein levels. They are primarily composed of the outer layer of rice grains and serve as a bulk feed or filler in livestock diets.

Carbonaceous roughages are typically lower in protein and higher in energy, making them suitable for providing fiber in the diet while not contributing significantly to protein needs. In contrast, Timothy hay, alfalfa hay, and clover hay are all classified as proteinaceous roughages. These hays have higher protein content due to the types of grasses or legumes they are derived from, making them valuable for meeting the nutritional needs of livestock, particularly for growth and production. Therefore, recognizing the characteristics of carbonaceous versus proteinaceous roughages aids in proper feed formulation and dietary planning for livestock.