Science Fair Project Encyclopedia
The stomach of a cow, goat, sheep or antelope is insufficient on its own to break down the cellulose of plant matter, a necessary step on the way to the digestion of food such as pasture grass. The ingested material is therefore regurgitated as cud, and slowly chewed in the animal's mouth (usually while the animal is at rest) to properly combine the food and bile and to render the plant fibers digestible. The cud is then swallowed, and the latter two chambers of the stomach (the omasum and abomasum) continue the process of digestion.
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