ANSC Feeds Practice Exam

Feedstuffs in the proteinaceous roughage classification typically contain what percentage of crude protein?

1. Less than 5%

2. Between 5% and 10%

3. More than 10%

4. Between 10% and 15%

The correct answer is: More than 10%

The classification of proteinaceous roughages is important in animal nutrition because it indicates the quality and content of protein provided by these feeds. Proteinaceous roughages are typically derived from legume forages, certain types of hays, and silages that are known for their higher protein content compared to other types of roughages like grasses. Feedstuffs categorized as proteinaceous roughages usually contain more than 10% crude protein. This level of protein is derived from the inherent characteristics of legumes and similar forage crops, which have a greater capacity to fix nitrogen from the atmosphere. This nitrogen fixation translates into higher protein concentrations in the plant tissue, making these feeds essential for livestock diets, particularly in supporting growth, milk production, and overall animal health. While feeds containing less than 10% crude protein might feature in other categories like non-proteinaceous roughages or low-quality forages, proteinaceous roughages, by definition, rise above this threshold due to their specific nutrient profiles. Therefore, the correct understanding of proteinaceous roughages reflects their significant role in livestock nutrition as a source of quality protein, justifying why the selected answer is correct.