ruminant stomach

abomasum anatomy animal antelope bio biology bolus camels cattle compartment cow cross cud cutaway deer diagram digestive disease education elements esophagus fardel fermentation fermenters giraffes goats hindgut inner intestine learning llamas mammal manyplies omasum psalterium research reticulum rumen ruminant ruminantia ruminants schematic scheme school schooling science scientific section sectional sheep small stomach structure system tract vector yaks