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Rumination is the peculiar process of digestion observed in the Ruminant class of mammals. Rumination helps the animals to extract maximum possible nutrients from the plant materials.Rumination, also called cud-chewing, is the process by which the cow regurgitates (casts up) previously consumed feed and masticates it a second time. The re-chewed feed with saliva is formed into a bolus and swallowed a second time. It is the floating, large particles on top of the rumen which are re-chewed