ruminant digestive system. feature of ruminants is the large ruminal storage capacity that gives them the ability to consume feed rapidly and complete the chewing process later. Ruminants' stomachs have four compartments: rumen — primary site of microbial fermentation; reticulum; omasum — receives chewed cud, and absorbs volatile fatty acids abomasum — true stomach. Vector diagram for your design, education, science and veterinary use