A note on the frequency of gastric ulcers detected during post-mortem examination at a pig abattoir.

There is growing interest in using findings from post-mortem meat inspection as indicators of on-farm and preslaughter animal welfare. This study considered whether oesophago-gastric ulcers might be a useful feature in pigs. The stomachs of 9827 finishing pigs from 60 farms were examined to provide an estimate of the frequency of oesophago-gastric ulcers in England. Stomachs were graded using a four-point scale ranging from normal, hyperkeratotic, eroded or ulcerated with or without stenosis. Over 79% of stomachs had either an oesophago-gastric ulcer or visible pre-ulcerative changes, including hyperkeratosis of the epithelium lining the pars oesophagea. The frequency of severe ulceration (Grade 3) was 6%, and mild ulcers (Grades 1 and 2) 73%. There was a significantly higher frequency of oesophago-gastric lesions in the groups of pigs that were held at the abattoir overnight, compared with those slaughtered on the day of arrival. This could have been due to the combined effect of overnight fasting plus stress in an unfamiliar environment. However, the exact fasting times of the animals were unknown and so it was not possible to provide a precise assessment of the effect of feed withdrawal.