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Cows are ruminants. They have a foregut fermentation chamber that contains millions of bacteria which help break down the plant matter that the cow has swallowed. The gas that is produced--being methane--from the fermentation process needs to be released, hence the fact that cows need to belch almost once per minute. Chewing is to stimulate further digestion that the rumen bacteria could not do themselves, plus it also puts more "water" (in the form of saliva) into the rumen to help bacteria move around, reproduce and consume what the cow has swallowed.

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Q: Why do cows do so much chewing and belching?
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