Definitions for abomasumˌæb əˈmeɪ səm
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abomasum, fourth stomach(noun)
the fourth compartment of the stomach of a ruminant; the one where digestion takes place
The fourth or digestive stomach of a ruminant, which leads from the third stomach, the omasum.
Origin: New Latin, from ab + omasum
alt. of Abomasus
The abomasum, also known as the maw, rennet-bag, or reed tripe, is the fourth and final stomach compartment in ruminants. It secretes rennet, which is used in cheese creation. The word abomasum is from New Latin and it was first used in English in 1706. It comes from Latin ab- + omasum "intestine of an ox," and it is possibly from the Gaulish language. The abomasum's normal anatomical location is along ventral midline. It is a secretory stomach similar in anatomy and function as the monogastric stomach. It serves primarily in the acid hydrolysis of microbial and dietary protein, preparing these protein sources for further digestion and absorption in the small intestine. Dairy cattle on high production diets are susceptible to a number of pathologies, most commonly after calving. A gas filled abomasum can move into an abnormal location resulting in left displaced abomasum or right displaced abomasum. If the abomasum displaces to the right, it is at risk of torsion and becoming a right torsioned abomasum. A displaced abomasum will cause cows to present all or some of the following signs: loss of appetite, decrease rumen contractions, decrease cud chewing, and drop in milk production. While an LDA and RDA are not immediately life threatening, veterinary care is required for surgical correction. Abomasitis is a relatively rare, but serious, disease of the abomasum whose causes are currently unknown.
U.S. National Library of Medicine
The fourth stomach of ruminating animals. It is also called the "true" stomach. It is an elongated pear-shaped sac lying on the floor of the abdomen, on the right-hand side, and roughly between the seventh and twelfth ribs. It leads to the beginning of the small intestine. (From Black's Veterinary Dictionary, 17th ed)
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