ANSC Feeds Practice Exam

How many of the following feeds are classified as carbonaceous concentrates: corn grain, cottonseed meal, soybean hulls, and barley straw?

1. 2

2. 3

3. 4

4. 5

The correct answer is: 3

Carbonaceous concentrates are high-energy feeds primarily composed of carbohydrates, typically containing less than 20% crude protein. When examining the feeds listed: - Corn grain is a primary carbohydrate source and is classified as a carbonaceous concentrate due to its high starch content. - Cottonseed meal, on the other hand, is classified as a proteinaceous concentrate because it is rich in protein (containing around 36-40% crude protein) and not primarily a source of carbohydrates. - Soybean hulls, while somewhat fibrous, are primarily composed of carbohydrate fractions, particularly hemicellulose and cellulose, and can be considered a carbonaceous concentrate although they offer less energy than pure grains. - Barley straw consists mainly of cellulosic material and is primarily a roughage rather than a concentrated energy source, thus is not classified as a carbonaceous concentrate. Based on this evaluation, corn grain, soybean hulls, and even though it is less typical, could be factored in as a carbonaceous concentrate in certain contexts. Therefore, identifying corn grain and soybean hulls fits the criteria, leading to the conclusion that three feeds in total align with this classification.