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(vertebrate zoology)
The final chamber of the complex stomach of ruminants; has a glandular wall and corresponds to a true stomach.



the fourth and last part of the multicompartmental stomach of ruminants, corresponding to the simple uncompartmental stomach of most mammals. The abomasum is connected to the omasum (third stomach) and the duodenum. The mucous membrane of the abomasum is covered by prismatic epithelium and contains fundic, pyloric, and cardiac glands. It forms 13 or 14 long folds, which enlarge its surface. In young animals the mucous membrane of the abomasum produces rennin. The muscular membrane of the abomasum consists of external longitudinal and internal circular layers. Food is digested in the abomasum by gastric juice.

References in periodicals archive ?
Knowlton (1998) has concluded that ruminal and abomasal infusion of starch at 1,500 g/d has been shown to increase plasma insulin concentrations in lactating cows from day 24 to day 72, which was consistent with the results of cows receiving 1,500 g/d duodenal glucose infusion (Lemosquet et al.
Interestingly, comparison made between ruminal and abomasal infusion treatments, cows receiving starch through rumen performed better than directly through the abomasum with higher AUC (p = 0.
The pooled weight of pre-scapular lymph nodes was comparable between both C and T groups; however, abomasal lymph nodes weight was significantly higher (p<0.
contortus caused extensive abomasal tissue damage, haemorrhage and protein losses and redirected protein synthesis away from growth.
Pancreatic exocrine secretion and plasma concentration of some gastrointestinal hormones in response to abomasal infusion of starch hydrolyzate and/or casein.
Net nutrient flux by visceral tissues of beef steers given abomasal and ruminal infusions of casein and starch.
Dosedependent reduction in milk fat secretion with abomasal infusion of trans-10, cis-12 conjugated linoleic acid (CLA) and comparison to diet-induced milk fat depression.
The unsupplemented animals (control) and those that received the sucrose supplement through both ruminal and abomasal routes ([E.
The abomasal mucosa and pancreas were all minced with scissors, and homogenized in 5 volumes of ice-cold 0.
Insulin reduces the rate of abomasal emptying, and cows with a displaced abomasum exhibit a resistance to insulin, which can lead to higher serum insulin concentrations (Cameron et al.
1,111 g/d for control and bran diets (average of SH and WB diets), respectively) because increasing abomasal protein flow of steers has been reported to increase quantity of starch disappearing in the small intestine (Richards et al.