Texas FFA Livestock Judging PracticeTest

What is the largest compartment of the ruminant stomach for a mature grazing cow called?

1. Reticulum

2. Rumen

3. Abomasum

4. Omasum

The correct answer is: Rumen

The largest compartment of the ruminant stomach in a mature grazing cow is called the rumen. The rumen serves as a fermentation chamber where microbial digestion of fibrous plant materials primarily occurs. It can hold a substantial volume, typically around 30 to 50 gallons in an adult cow, which allows it to break down tough forage through microbial action. This process is essential for ruminants, as it enables them to extract necessary nutrients from plant materials that are otherwise indigestible. In addition to its size, the rumen plays a vital role in the overall digestive process of a cow. It is lined with millions of microorganisms, including bacteria and protozoa, which contribute to the breakdown of cellulose and other complex carbohydrates. This process not only ferments the feed but also produces volatile fatty acids, which are a primary energy source for ruminants. Understanding the function of the rumen is crucial for effective livestock management and nutrition, as it directly impacts the health and productivity of grazing cows.