ANSC Feeds Practice Exam

Cows fed hay containing 30% ADF will likely consume more than cows fed hay with what percentage of ADF?

1. 20%

2. 40%

3. 50%

4. 60%

The correct answer is: 50%

Cows' feed intake is influenced by various factors, including the fiber content of the forage they consume, often assessed through Acid Detergent Fiber (ADF) levels. Higher ADF levels in forage generally correlate with lower palatability and digestibility, which impacts overall feed intake. For cows that are fed hay containing 30% ADF, they will consume more compared to those offered hay with significantly higher ADF levels. Specifically, as the ADF percentage increases, the challenging digestibility and lower nutritional value tend to dissuade consumption. Therefore, cows fed hay with ADF levels above 30%, such as those at 40% and especially at 50% and beyond, would likely consume less due to the increased fibrousness and decreased digestibility. This relationship is an essential consideration in managing feeding practices to ensure that cows maintain optimal health and production levels. Thus, the correct choice indicates a previously mentioned threshold where the 30% ADF level serves as a critical point above which feed intake is negatively affected.