Abomasum

Abomasum

The abomasum, also known as the maw [http://www.chambersharrap.co.uk/chambers/index.shtml The Chambers Dictionary, Ninth Edition, Chambers Harrap Publishers, 2003] ] , and the rennet-bag, is the fourth and final stomach compartment in ruminants. The 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 (LDA) or right displaced abomasum (RDA). If the abomasum displaces to the right, it is at risk of torsion and becoming a right torsioned abomasum (RTA). 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.

It secretes rennet, an ingredient 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.

References


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  • Abomasum — Ab o*ma sum, ||Abomasus Ab o*ma sus, n. [NL., fr. L. ab + omasum (a Celtic word).] (Anat.) The fourth or digestive stomach of a ruminant, which leads from the third stomach omasum. See {Ruminantia}. [1913 Webster] …   The Collaborative International Dictionary of English

  • abomasum — [abɔmasɔm] ou abomasus [abɔmasys] n. m. ÉTYM. Déb. XVIIIe (attesté dans Trévoux, 1740); en angl., 1706; du lat. sc. abomasus, um, de ab , et omasum « tripes de bœuf ». ❖ ♦ Didact. (sc.). Quatrième compartiment de l estomac des ruminants, ayant… …   Encyclopédie Universelle

  • abomasum — [ab΄ə mā′səm] n. pl. abomasa [ab΄ə mā′sə] [ModL < AB + OMASUM] the fourth, or digesting, chamber of the stomach of a cud chewing animal, as the cow: see RUMINANT …   English World dictionary

  • Abomasum — Caillette (organe)  Pour l’article homonyme, voir caillette.  Système digestif d un ruminant (vache). m. œsophage, v. rumen ou panse, n. réticulum ou réseau, b. omasu …   Wikipédia en Français

  • Abomasum — šliužas statusas T sritis gyvūnų anatomija, gyvūnų morfologija atitikmenys: lot. Abomasum ryšiai: platesnis terminas – skrandis siauresnis terminas – didžioji kreivė siauresnis terminas – mažoji kreivė siauresnis terminas – pasieninis paviršius… …   Veterinarinės anatomijos, histologijos ir embriologijos terminai

  • Abomasum Search —    The abomasum is the fourth chamber of the deer stomach. This, along with the omasum, is considered the true stomach. It helps further digestion by producing acids to break down the food particles and the microorganisms from the rumen. This… …   Hunting glossary

  • abomasum — noun (plural abomasa) Etymology: New Latin, from Latin ab + omasum ox s tripe Date: circa 1706 the fourth compartment of the ruminant stomach that follows the omasum and has a true digestive function compare rumen, reticulum • abomasal …   New Collegiate Dictionary

  • abomasum — /ab euh may seuhm/, n., pl. abomasa / seuh/. the fourth or true stomach of cud chewing animals, lying next to the omasum. See diag. under ruminant. [1700 10; < NL; see AB , OMASUM] * * * …   Universalium

  • abomasum — noun The fourth or digestive stomach of a ruminant, which leads from the third stomach, the omasum. Syn: rennet stomach …   Wiktionary

  • abomasum — ab·oma·sum .ab ō mā səm n, pl sa sə the fourth compartment of the ruminant stomach that follows the omasum and has a true digestive function compare RUMEN, RETICULUM ab·oma·sal səl adj …   Medical dictionary

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