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 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, 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]].  

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.  

Rotation of the abomasum on its mesenteric axis leads to volvulus and constriction of blood vessels and trauma to the vagus nerve resulting in abomasal distenstion with blood-stained fluid and gas, congested mucosa and necrosis of the abomasum, dehydration and circulatory collapse.  

Rotation of the abomasum on its mesenteric axis leads to volvulus and constriction of blood vessels and trauma to the vagus nerve resulting in abomasal distenstion with blood-stained fluid and gas, congested mucosa and necrosis of the abomasum, dehydration and circulatory collapse.  

Additionally the abomasum may rupture, causing peritonitis, shock and death.  

Additionally the abomasum may rupture, causing peritonitis, shock and death.

==Laboratory Tests==

==Laboratory Tests==