ruminant digestive system: rumen, reticulum, omasum, and abomasum

abomasum anatomy and animal antelope biological biology camels cattle compartments cow design diagram digestion digestive domestic education educational esophagus fermentation food for four goats have health illustration internal intestine mammal medical microbial milk model nature omasum organ organs parts primary research reticulum rumen ruminant ruminants science section sheep site small stomach system tract true use vector vet