Embedded Files
Image found in lecture 26-28
Ruminants
Ruminants
Cows are ruminants, so they have a 4 chambered stomach, instead of four stomachs like some people might believe:
Rumen
Reticulum
Omasum
Abomasum
FORESTOMACH: NONGLANDULAR REGION OF STOMACH
FORESTOMACH: NONGLANDULAR REGION OF STOMACH
Rumen
Rumen
The main chamber of the stomach, the biggest in adult bovine but regressed in fetal calves
Large vat where fermentation occurs and absorption of volatile fatty acids
Contains papillae and microbes
Reticulum
Reticulum
Right next to the rumen, and works with the rumen in rumination
Honeycomb shaped appearance and will sort different densities of materials swallowed by cow
The shared space of rumen and reticulum is the ruminoreticulum
Omasum
Omasum
Site of water absorption and some minerals
Has laminae, which are smilar to the sheets of a book
Rumination!
Rumination!
Large image found in: https://www.google.com/url?sa=i&url=https%3A%2F%2Fextension.umn.edu%2Fdairy-nutrition%2Fruminant-digestive-system&psig=AOvVaw008U_h9gAqXC_1TGiQ1JTl&ust=1701570023201000&source=images&cd=vfe&opi=89978449&ved=0CBQQjhxqFwoTCJid4rjY74IDFQAAAAAdAAAAABADSmaller picture: found in lecture 26-28
TRUE STOMACH
TRUE STOMACH
Abomasum
Abomasum
True stomach of the cow
Glandular, possessing gastric cells and secretions
Simple columnar
Regions similar to fundic glands and pyloric glands in simple stomach
True digestion will occur here
Cardiac and pylorus regions are located here
Image found in lecture 26-28
Gastric Cells
Gastric Cells
Epithelial Cells: Epithelium(💡Easy way to remember)
Mucous Cells: secrete mucous
Parietal Cells: secrete hydrochloric acid
Chief cells: secrete pepsinogen and rennin
Enteroendocrine: secretes hormones(💡Good way to remember: endocrine = hormones)
Microbes
Microbes
Microbes produce cellulase(an enzyme) to digest cellulose and produce microbial proteins
Microbes are a major source of dietary protein for ruminants!
Byproducts: methane and carbon dioxide
Volatile fatty acids: butyric, acetic, propionic
What is the major source of protein in ruminants?
What is the major source of protein in ruminants?
Microbes
What does the reticulum look like?
What does the reticulum look like?
Honeycomb
Page updated
Report abuse