Abomasum

The fourth compartment, known as the abomasum, is the deer's "true" stomach, and it functions in a very similar manner to yours. ❋ Unknown (2005)

The fourth stomach, the abomasum, is most similar to the human stomach. ❋ Unknown (2008)

  The fourth stomach, the abomasum, is most similar to the human stomach. ❋ Unknown (2008)

Mostly I see seconday ketosis due to digestive problems, such as a displaced abomasum and the cow simply has no desire to eat. ❋ Unknown (2007)

This is best described as sub-tripe; perhaps originating from the abomasum or duodenum regions. ❋ Unknown (2007)

The Defiled Warrior is best described as sub-tripe; perhaps originating from the abomasum or duodenum regions. ❋ Unknown (2007)

The Curdling Specialist Traditional rennet is made from the fourth stomach or abomasum of a milk-fed calf less than 30 days old, before chymosin is replaced by other protein-digesting enzymes. ❋ Harold McGee (2004)

"Yes, Mr. Stott, it's the tinkling sound you hear in displacement of the abomasum." ❋ Herriot, James (1992)

As noted, the stomach consists of three functional compartments: the rumen, the reticulum, and the abomasum. ❋ Unknown (1991)

The four compartments into which it is divided are the rumen, reticulum, omasum, and abomasum or true stomach. ❋ R. A. Craig (N/A)

In the adult form it attaches itself to the mucous membrane of the fourth stomach or abomasum, and lives by sucking blood. ❋ R. A. Craig (N/A)

_The abomasum_ is lined by a gastric mucous membrane. ❋ R. A. Craig (N/A)

The abomasum or "reed" is of great length, and the rumen or paunch is lined with cells, deep and narrow, like those of a honeycomb, closed by a membrane, the orifice of which is at the control of the animal. ❋ Robert Armitage Sterndale (1870)

It is not quite clear what the peculiar functions of this chamber are, but the semi-liquid food, passing through it, goes into the proper stomach (abomasum or reed) and is here acted upon by the gastric juice. ❋ Robert Armitage Sterndale (1870)

Rennin is a coagulating enzyme produced in the inner lining of the abomasum (the fourth / true stomach) of the milk-fed calf.

MilkBar nipples are designed to discourage gulping, satisfy the calf's urge to suck and promote maximum salivation, which delivers antibodies and digestive enzymes to maximize health and growth, while the slow-nursing nipple ensures the milk goes into the abomasum, not the rumen, to prevent scours.

"They damage the abomasum and adversely affect digestion and feed conversion." ❋ Unknown (2008)

‘enystrum’ (or abomasum), larger an longer than the echinus, furnished inside with numerous folds or ridges, large and smooth. ❋ Unknown (2002)

[The base] of the [abomasum] is turned to the [omasum]. ❋ Joyful Coffee (2022)