GASTRIC-ULCERS IN FINISHING PIGS - THEIR PREVALENCE AND FAILURE TO INFLUENCE GROWTH-RATE

In an abattoir survey the stomachs of 1242 pigs from 15 farms were exa mined. Ulceration of the pars oesophagea was present in 22.95 per cent with a range from 4.7 to 57.4 per cent, The ulcers were graded mild i n 9.5 per cent and severe in 13.4 per cent of the stomachs. Bile stain ing and hyperkeratinisation of the pars were significantly more common in stomachs with ulcers than in those without (P<0.001), although the difference between the hyperkeratinisation in cases with severe ulcer s and cases without ulcers was not significant. The daily liveweight g ains of 208 males and 150 females from two units with a high prevalenc e of ulcers were calculated from their weaning weights at about five w eeks of age and their slaughter weights at around 90 kg. At the abatto ir their stomachs were examined for the presence of ulcers of the pars . The daily liveweight gain of the males was significantly greater tha n that of the females (P<0.001), but the presence of mild or severe ul cers had no influence on the rate of gain of the pigs from either unit . The prevalence of ulcers in the males and females was 57.2 and 49.3 per cent, respectively, but the difference was not significant.