Transcript Slide 1

Animal Science Frameworks
Presentation Unit 3
Mr. Sullivan
Ruminant and Monogastric
Ruminants have a four- part stomach
Monogastrics have a simple stomach or
sometimes its called one- stomached
The Forestomach Components of
Ruminant Animals
Rumen
The rumen is an enormous space filled with
chewed and half-chewed materials the cow has
ingested, swallowed, regurgitated, and
swallowed again (often several times).
The cow who "chews her cud" is methodically
grinding the food into smaller and smaller bits,
allowing the symbionts more and more surface
area on which to work.
Reticulum
It consists of bands of smooth muscle which
run through the tops of the ridges of the
honeycomb, and which are more or less
isolated from the lower levels, nearer the wall.
Omasum
This organ has a number of colorful layman's
names applied to it, among them "many-plies"
and "the butcher's Bible," the latter referring to
its similarity to the leaves of a book in gross
appearance.
Abomasum
The true glandular stomach of ruminants.
Its histology is very similar to the fundic region of
the stomach of monogastric animals.
The surface epithelium here is simple columnar, not
stratified squamous. There are gastric pits (foveolae)
and below those, there are gastric glands of the fundic
type. The glands contain parietal cells (which make
hydrochloric acid) and chief or zymogenic cells
which make digestive enzymes.
Review of the four-part Ruminant
Stomach Parts
Rumen
Reticulum
Omasum
abomasum
Monogastric (non-ruminant)
One or simple stomach structure
mostly carnivores and omnivores
Monogastric Animal Digestive Tract
Mouth
Stomach
Small Intestine
Large Intestine or Colon