ruminant digestive system. four compartments of ruminants` stomach

abomasum anatomy animal antelope art biology black bolus camels cattle chewing compartment compartments cow cud deer diagram digestive domestic education engraving esophagus feature fermentation four goats illustration internal intestine large mammal manyplies medical model nature omasum organ research reticulum rumen ruminal ruminant ruminantia ruminants science section sheep small stomach storage system tract veterinary vintage