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Some animals, like cattle and sheep, are what animal scientists call âruminants,â which means that they digest their food by fermenting it in a four-chambered stomach. Inside the stomach, there are bacteria that work to break down the tough stalks of the plants the ruminant animal has eaten.
The rumen and reticulum (reticulo-rumen) is the largest compartment of the cowâs stomach. Fiber, starch, sugar, and proteins are fermented by the microbes to form volatile fatty acids and microbial protein.Rumen papillae absorb volatile fatty acids.icroscopic organisms called rumen microbes break down (or digest) ingested feed by a fermentation process. The rumen is the major site of fermentation in the cow. There are1,000,000,000 to 10,000,000,000 bacteria per ml, 1,000,000 protozoa per ml, and a variable amount of fungi.