ANSC Feeds Practice Exam 2025 - Free Practice Questions and Study Guide

Fiber is essential in ruminant diets primarily because it supports rumen health and aids digestion. In ruminants, such as cows and sheep, the rumen is a crucial part of their digestive system, where microbial fermentation takes place. The presence of adequate fiber in the diet stimulates the production of saliva, which contains bicarbonate that helps to maintain the proper pH in the rumen. This pH balance is vital for the growth and efficiency of the beneficial microbes that break down fibrous plant materials.

Moreover, fiber promotes normal rumination, which is the process of chewing cud. The act of chewing not only further breaks down the feed particles but also enhances saliva production, thereby contributing to the overall digestive process. A diet that is too low in fiber can lead to various digestive disorders, including acidosis, which can harm the animal's health.

Other options do not adequately address the vital function of fiber in ruminant health. While vitamins are important, fiber does not solely provide them. Fiber does not decrease rumination time; in fact, it encourages rumination. Additionally, fiber does not replace carbohydrates; rather, it functions alongside them to provide a balanced and healthy diet for ruminants.