Pathogenesis of Abomasal Impaction in Cows

Abstract

The cause of abomasal impaction in 13 cows affected with it was investigated. The 12 of 13 cases occured after abomasal displacement. Of 6 cases where abomasotomy was performed, 5 cases without abomasal dilatation recovered and 1 died a day after. The 6 of 7 cases observed during pathological autopsy were treated with surgical correction of abomasal displacement. The pathological findings included patent omasoabomasal dilatation, abomasal dilatation, abomasal ulcer and peritonitis. Histopathologically, tunica muscularis of abomasum were observed diffuse granulation, thrombosis and vacuolar degeneration of smooth muscle. These results indicate that serious abomasal displacement and right-side abomasal displacement with torsion caused functional and organic disorders in the abomasum, leading to patent abomasal impaction.