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How rumination works
Rumination works by chewing and swallowing in the normal way to begin with, and then regurgitating the semi-digested cud to re-chew it and to get the most food value out of it.
Rumination makes the half-digested food particles smaller, before they can go through the process of digestion.
The primary difference between a ruminant and non-ruminants (such as people, dogs, and pigs) is that ruminants have a four-compartment stomach.
The four parts of the stomach are the rumen, reticulum, omasum, and abomasum. In the first two chambers, the rumen and the reticulum, the food is mixed with saliva and separates into layers of solid and liquid material. Solids clump together to form the cud or bolus.
Even though the rumen and reticulum have different names, they are the same functional space, as the digesta (food material) can move back and forth between them.
The digesta then passes into the next chamber, the omasum, where water and many of the mineral elements are absorbed into the blood stream.
After this the digesta is moved to the true stomach, the abomasum. Digestion takes place here.
Almost all the glucose produced by breaking down the cellulose is used by microbes in the rumen, and so ruminants usually absorb little glucose from the small intestine. Rather, ruminants' requirement for glucose (for brain function and lactation if appropriate) is made by the liver.
Where ruminants are found
- Hackmann. T. J., and Spain, J. N. 2010."Ruminant ecology and evolution: Perspectives useful to livestock research and production". Journal of Dairy Science, 93:1320–1334