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The abomasum, also known as the maw, and the rennet-bag, is the fourth and final stomach
Stomach

In most mammals, the stomach is a hollow muscular organ of the gastrointestinal tract involved in the second phase of digestion, following mastication....
 compartment in ruminants. The normal anatomical location is along ventral midline. It is a secretory
Secretion

Secretion is the process of, elaborating and releasing Chemical compound from a cell , or a secreted chemical substance or amount of substance. In contrast to excretion, the substance may have a certain function, rather than being a waste product....
 stomach similar in anatomy
Anatomy

Anatomy is a branch of biology that is the consideration of the body plan. It is a general term that includes human anatomy, animal anatomy and plant anatomy ....
 and function as the monogastric
Monogastric

A monogastric organism has a simple single chambered stomach, and is the alternate gastric complex to a four-chambered complex stomach known as a ruminant. Examples of monogastric animals include humans, pigs, dogs, and cats....
 stomach. It serves primarily in the acid
Acid

An acid is traditionally considered any chemical compound that, when dissolved in water, gives a solution with a hydrogen ion Activity greater than in pure water, i.e....
 hydrolysis
Hydrolysis

Hydrolysis is a chemical reaction during which one or more water are split into hydrogen and hydroxide ions which may go on to participate in further reactions....
 of microbial and dietary protein
Protein

Proteins are organic compounds made of amino acids arranged in a linear chain and joined together by peptide bonds between the carboxyl and amino groups of adjacent amino acid Residue ....
, preparing these protein sources for further digestion
Digestion

Digestion is the mechanical and chemical breaking down of food into smaller components, to a form that can be Absorption, for instance, by a blood stream....
 and absorption
Digestion

Digestion is the mechanical and chemical breaking down of food into smaller components, to a form that can be Absorption, for instance, by a blood stream....
 in the small intestine
Small intestine

In vertebrates, including mammals, reptiles, birds, and bony fish, the small intestine is the part of the gastrointestinal tract following the stomach, and is where the vast majority of digestion takes place....
.

Dairy cattle on high production diets are susceptible to a number of pathologies, most commonly after calving.






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The abomasum, also known as the maw, and the rennet-bag, is the fourth and final stomach
Stomach

In most mammals, the stomach is a hollow muscular organ of the gastrointestinal tract involved in the second phase of digestion, following mastication....
 compartment in ruminants. The normal anatomical location is along ventral midline. It is a secretory
Secretion

Secretion is the process of, elaborating and releasing Chemical compound from a cell , or a secreted chemical substance or amount of substance. In contrast to excretion, the substance may have a certain function, rather than being a waste product....
 stomach similar in anatomy
Anatomy

Anatomy is a branch of biology that is the consideration of the body plan. It is a general term that includes human anatomy, animal anatomy and plant anatomy ....
 and function as the monogastric
Monogastric

A monogastric organism has a simple single chambered stomach, and is the alternate gastric complex to a four-chambered complex stomach known as a ruminant. Examples of monogastric animals include humans, pigs, dogs, and cats....
 stomach. It serves primarily in the acid
Acid

An acid is traditionally considered any chemical compound that, when dissolved in water, gives a solution with a hydrogen ion Activity greater than in pure water, i.e....
 hydrolysis
Hydrolysis

Hydrolysis is a chemical reaction during which one or more water are split into hydrogen and hydroxide ions which may go on to participate in further reactions....
 of microbial and dietary protein
Protein

Proteins are organic compounds made of amino acids arranged in a linear chain and joined together by peptide bonds between the carboxyl and amino groups of adjacent amino acid Residue ....
, preparing these protein sources for further digestion
Digestion

Digestion is the mechanical and chemical breaking down of food into smaller components, to a form that can be Absorption, for instance, by a blood stream....
 and absorption
Digestion

Digestion is the mechanical and chemical breaking down of food into smaller components, to a form that can be Absorption, for instance, by a blood stream....
 in the small intestine
Small intestine

In vertebrates, including mammals, reptiles, birds, and bony fish, the small intestine is the part of the gastrointestinal tract following the stomach, and is where the vast majority of digestion takes place....
.

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
Rennet

Rennet is a natural complex of enzymes produced in any mammalian stomach to digest the mother's milk, and is often used in the production of cheese....
, an ingredient used in cheese creation.

The word abomasum is from New Latin
New Latin

The term New Latin or Neo-Latin is used to describe a form the Latin language used after the end of the Medieval Latin period to c. 1900, and in a very limited fashion, down to the present day....
 and it was first used in English
English language

English is a West Germanic language that originated in Anglo-Saxon England and has lingua franca status in many parts of the world as a result of the military, economic, scientific, political and cultural influence of the British Empire in the 18th, 19th and early 20th centuries and that of the United States from the mid 20th century onwa...
 in 1706. It comes from Latin
Latin

Latin is an Italic language, historically spoken in Latium and Ancient Rome. Through the Military history of the Roman Empire, Latin spread throughout the Mediterranean and a large part of Europe....
 ab- + omasum
Omasum

The omasum, also known as the bible, the fardel, the manyplies and the psalterium, is the third compartment of the stomach in ruminants....
 "intestine
Intestine

In anatomy, the intestine is the segment of the Gastrointestinal tract extending from the stomach to the anus and, in humans and other mammals, consists of two segments, the small intestine and the large intestine....
 of an ox
Cattle

Cattle, colloquially referred to as cows, are domestication ungulates, a member of the subfamily Bovinae of the family Bovidae. They are raised as livestock for meat , dairy products , leather and as draft animals ....
," and it is possibly from the Gaulish language
Gaulish language

The Gaulish language is the Celtic language that was spoken in Gaul before the Vulgar Latin of the late Roman Empire became dominant in Roman Gaul....
.