ANSC Feeds Practice Exam

Processing corn into grain affects its digestibility in cattle by what outcome?

1. Decreasing digestibility

2. Causing it to remain the same

3. Resulting in variable digestibility

4. Increasing digestibility

The correct answer is: Increasing digestibility

Processing corn into grain can enhance its digestibility in cattle. This improvement occurs primarily because processing methods, such as grinding or rolling the corn, break down the kernel structure, making the starches more accessible to the digestive enzymes in the cattle's gastrointestinal system. In an unprocessed state, whole corn kernels can be more difficult for cattle to digest due to their tough outer hull and the intact structure, which limits the surface area available for enzymatic action. Processing disrupts this structure, allowing for easier fermentation and breakdown by rumen microbes, leading to more efficient nutrient absorption. As a result, processed corn provides a more readily metabolizable energy source for cattle, which can positively influence their overall growth and production performance. While there are conditions under which digestibility may vary—such as differences in processing methods, the specific variety of corn used, or the individual animal's digestive capabilities—overall, processing corn generally leads to increased digestibility.