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Abomasal ulcer in adult cattle from abattoir. Abomasa from 291 cattle over 12 months of age slaughtered at Swedish meats in Uppsala during September 2003 were examined. Abomasal lesions were assessed macroscopically. Of the examined abomasa 108 (37.1 %) had lesions such as erosions and/or ulcers. Of these, 75.9 % had erosions, 13.0 % had ulcus and 11,1 % had both ulcers and erosions. The erosions were generally smaller than the ulcerations (90,7 % of the erosions were < 10 mm while 75,6 % of the ulcerations were > 10 mm). About 70 % of the pathological abomasa had up to five lesions while the rest showed six or more. Most lesions were located in the fundic part of the abomasa (86.6 % of the erosions and 64.4 % of the ulcerations) which is in accordance with other findings. Compared to other in...