Pertaining to or emanating from the omasum.
- o. atony — due to poorly digestible roughage in the diet; feed stagnates, leading to atony and eventually impaction.
- o. functional stenosis — achalasia of the reticulo-omasal sphincture as part of the syndrome of vagus indigestion of cows; causes accumulation of ingesta in the reticulorumen.
- o. impaction — usually identified at autopsy. Clinically there is recurrent indigestion with anorexia, scant, hard feces and possibly palpation of hard, distended omasum through the right flank or per rectum.
- o. sulcus — see omasal groove.
- o. transport failure — see vagus indigestion.
