ANSC Feeds Practice Exam

Which of the following is NOT considered a non-grass carbonaceous roughage?

1. Rice hulls

2. Wheat straw

3. Timothy hay

4. Soybean hulls

The correct answer is: Timothy hay

Timothy hay is considered a grass-based forage and is classified as a grass carbonaceous roughage. It is predominantly composed of grass species, making it a primary source of fiber for many herbivorous animals. In contrast, the other options listed, such as rice hulls, wheat straw, and soybean hulls, are by-products from different plants that do not fall under the category of grasses. Rice hulls and wheat straw are considered carbonaceous roughages made from the residues of rice and wheat plants, respectively. Soybean hulls are a by-product of soybean processing. These materials tend to be lower in protein and higher in fiber, which aligns with the characteristics of non-grass carbonaceous roughages. By identifying Timothy hay as a grass-based forage, it is clear why it does not fit the classification of non-grass carbonaceous roughages.