Changes

There are two manifestations of abomasal displacemet. In both the abomasum becomes trapped between [[Rumen - Anatomy & Physiology|rumen]] and abdominal wall. The more common presentation is the '''left displacement (LDA''') which is ventral and to the left of the rumen. The [[Omasum - Anatomy & Physiology|omasum]], [[Reticulum - Anatomy & Physiology|reticulum]] and [[Liver - Anatomy & Physiology|liver]] are also displaced.

There are two manifestations of abomasal displacemet. In both the abomasum becomes trapped between [[Rumen - Anatomy & Physiology|rumen]] and abdominal wall. The more common presentation is the '''left displacement (LDA''') which is ventral and to the left of the rumen. The [[Omasum - Anatomy & Physiology|omasum]], [[Reticulum - Anatomy & Physiology|reticulum]] and [[Liver - Anatomy & Physiology|liver]] are also displaced.

Abomasal atony and increased gas production leads to displacement. Factors reducing abomasal motility include a high concentrate diet, increased [[Volatile Fatty Acids|volatile fatty acids]] from the rumen, increased Non-Esterified Fatty Acids from body fat mobilisation, hypokalaemia, hyperinsulinaemia and periparturient disease e.g ketosis, hypocalcaemia and metritis. Displacement to the left results in a reduced flow of ingesta as well as reduced digestion resulting in anorexia and [[Dehydration|dehydration]].  

Abomasal atony and increased gas production leads to displacement. Factors reducing abomasal motility include a high concentrate diet, increased [[Volatile Fatty Acids|volatile fatty acids]] from the rumen, increased Non-Esterified Fatty Acids from body fat mobilisation, hypokalaemia<ref>Turck, G. & Leonhard-Marek (2010) Potassium and insulin affect the contractility of abomasal smooth muscle. Journal of Dairy Science. 93, 3561-3568</ref>, hyperinsulinaemia <ref>Turck, G. & Leonhard-Marek (2010) Potassium and insulin affect the contractility of abomasal smooth muscle. Journal of Dairy Science. 93, 3561-3568</ref><ref>Pravettoni, D., Doll, K., Hummel, M., Cavallone, E., Re, M. & Belloli, A.G. (2004) Insulin resistance and abomasal motility disorders in cows detected by use of abomasoduodenal electromyography after surgical correction of left displaced abomasum. American Journal of Veterinary Research, 65, 1319-1324</ref> and periparturient disease e.g ketosis, hypocalcaemia and metritis. Displacement to the left results in a reduced flow of ingesta as well as reduced digestion resulting in anorexia and [[Dehydration|dehydration]].  

A '''displacement to the right (RDA)''' is less common. Decreased abomasal motility, distension and displacement occurs as in the LDA.  

A '''displacement to the right (RDA)''' is less common. Decreased abomasal motility, distension and displacement occurs as in the LDA.