The fourth compartment, known as the abomasum, is the deer's "true" stomach, and it functions in a very similar manner to yours.    From Wordnik.com.  [Deer Professor Karl V.] Reference

The fourth stomach, the abomasum, is most similar to the human stomach.    From Wordnik.com.  [The Body of a Cow] Reference

  The fourth stomach, the abomasum, is most similar to the human stomach.    From Wordnik.com.  [The Body of a Cow] Reference

"Yes, Mr. Stott, it's the tinkling sound you hear in displacement of the abomasum.".    From Wordnik.com.  [Every living thing]

This is best described as sub-tripe; perhaps originating from the abomasum or duodenum regions.    From Wordnik.com.  [2007 March 09 « Whatever] Reference

As noted, the stomach consists of three functional compartments: the rumen, the reticulum, and the abomasum.    From Wordnik.com.  [26 Mouse Deer] Reference

The four compartments into which it is divided are the rumen, reticulum, omasum, and abomasum or true stomach.    From Wordnik.com.  [Common Diseases of Farm Animals] Reference

"They damage the abomasum and adversely affect digestion and feed conversion.".    From Wordnik.com.  [High Plains Journal] Reference

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

‘enystrum’ (or abomasum), larger an longer than the echinus, furnished inside with numerous folds or ridges, large and smooth.    From Wordnik.com.  [The History of Animals] Reference

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.    From Wordnik.com.  [Natural History of the Mammalia of India and Ceylon] Reference

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.    From Wordnik.com.  [Natural History of the Mammalia of India and Ceylon] Reference

"It is a condition where the fourth stomach or abomasum slips round from the right side to the left.    From Wordnik.com.  [Every living thing]

There’s a liturgical sound to our names for her stomachs—omasum, abomasum, reticulum—and in old words for these parts, you can hear a certain reverence: king’s-hood, the second stomach, and psalterium, the third.    From Wordnik.com.  [The Dirty Life] Reference

After the remasticated food has reached the manyplies, the groove in the reticulum is pushed open by a fresh bolus, and so the process is repeated until the food consumed has all passed on towards the abomasum or true digestive stomach. ".    From Wordnik.com.  [Natural History of the Mammalia of India and Ceylon] Reference

We never see a displaced abomasum.    From Wordnik.com.  [FWi - All News] Reference

Having completely comminuted and blended this mouthful, it is swallowed a second time; but instead of returning to the paunch or reticulum, it passes through another valve into a side cavity, — the omasum, where, after a maceration in more saliva for some hours, it glides by the same contrivance into the fourth pouch, — the abomasum, an apartment in all respects analogous to the ordinary stomach of animals, and where the process of digestion, begun and carried on in the previous three, is here consummated, and the nutrient principle, by means of the bile, eliminated from the digested aliment.    From Wordnik.com.  [The Book of Household Management] Reference