ANSC Feeds Practice Exam

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Which of the following feeds would have the highest acid detergent fiber?

Orchardgrass hay
Bermudagrass hay
Dallisgrass hay
Timothy hay

The correct answer is: Dallisgrass hay

Acid detergent fiber (ADF) is a measure of the fibrous content of plant materials, specifically the portions that are indigestible by ruminants and typically includes cellulose and lignin. The higher the ADF content, the lower the overall digestibility of the feed. In the context of the provided options, Dallisgrass hay generally has a higher ADF content compared to the other types of hay listed. This is because Dallisgrass, being a warm-season grass, tends to accumulate more lignin as it matures, leading to a greater overall fiber content. The more mature the plant, the higher the ADF, and Dallisgrass is known for its robust growth and higher fiber levels when compared to the other grass hays mentioned. Orchardgrass, Bermudagrass, and Timothy hay are typically considered to have lower ADF values as they are cooler-season grasses that have different growth patterns and lower mature fiber content when harvested at appropriate times. This means they are generally more digestible compared to Dallisgrass hay. Thus, Dallisgrass hay stands out as the correct choice due to its higher fiber content and lower digestibility.