Perforated abomasal ulcers in adult dairy cows.

Case records of adult dairy cattle with abomasal ulcers admitted to the University of Pennsylvania from 1968 through 1980 were evaluated. Of 6,385 adult dairy cattle admitted during that period, 69 had abomasal ulcers of clinical importance. Of 43 ulcers that had perforated, 17 were associated with local peritonitis and 22 were associated with diffuse peritonitis; 4 had perforated so recently that peritonitis had not had time to develop. Perforated ulcers were found in 40 cows that had recently calved (32 cows with ulcers that had perforated within 4 weeks after calving) and often had concurrent disease(s) (39 cows with at least one other disease). Ten cows with local peritonitis survived, whereas only 2 of the cows with diffuse peritonitis survived.