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Overview of Diseases of the Abomasum


Peter D. Constable

, BVSc (Hons), MS, PhD, DACVIM, College of Veterinary Medicine, University of Illinois at Urbana-Champaign

Last full review/revision May 2014 | Content last modified May 2014

Abomasal disorders include left displaced abomasum (LDA), right displaced abomasum (RDA), abomasal volvulus (AV), abomasal ulceration, and impaction. Displacement or volvulus is seen most commonly in dairy cows but can also be seen in dairy bulls and calves. Except for AV, abomasal displacement is rare in beef cattle and essentially undiagnosed in small ruminants. Abomasal ulcers are seen in dairy and beef cattle and in calves and lambs; they are rarely diagnosed in small ruminants. Impactions can be primary, which is most frequent in beef cattle, or secondary, which develop most often in dairy cows as a form of vagal indigestion. Impactions may have a hereditary basis in some black-faced sheep.

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Colic in Horses
Colic is a simple term meaning abdominal pain. There are many causes of colic in horses, with treatments ranging from administration of pain medication to abdominal surgery. Signs of colic are variable and do not indicate which part of the gastrointestinal tract is involved. Which of the following clinical signs is easily recognized as a common sign of colic? 
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