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ORAL PRESENTATIONS efficiency). By the end of the trial, the mean prevalence of pens from which Salmonella was isolated at least once was 42% (95% ci 27% 58%) for comparison farms and 38% (95% ci 22% 53%) for intervention farms. The prevalence of MJ ELISA positive pigs was 40% (95% ci 26% 58%) on intervention farms and 58% (95% ci 41% 75%) on comparison farms; this difference was not statistically significant (t-test; p=0.118). It was noted that one farm in the intervention group had no Salmonella isolated from any pen during the trial and only one of the 40 pigs tested had a positive MJ ELISA result. The data were used to investigate the impact of the prevalence of infected pens at the first sampling visit upon the outcome of the trial. There was a significant relationship between the prevalence of infected pens at the start of the trial and of the prevalence of pens that were ever infected (p<0.001). This is unsurprising, since across the whole trial 324 out of a total of 787 pen samples were positive and 242 of these occurred at the first visit. A pen from which Salmonella had been isolated on the first visit was nearly twice as likely to have Salmonella isolated on a subsequent occasion, compared to a pen that was negative on the first visit (odds ratio = 1.9; 95% ci 1.2 – 2.9). No significant association was detected between the prevalence of infected pens at the first visit and the prevalence of MJ ELISA positive pigs.

Selection of finishing pig herds with a low Salmonella prevalence for logistic slaughtering