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Inter-relationships of Salmonella status of flock and grow-out environment at sequential segments in broiler production and processing
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Effective Salmonella control in broilers is important from the standpoint of both consumer protection and industry viability. We investigated associations between Salmonella recovery from different sample types collected at sequential stages of one grow-out from the broiler flock and production environment. Broiler flock Salmonella status at the end of the grow-out cycle, as measured by three different sample types, was associated with flock status upon delivery from the hatchery, but not with prior contamination of the grow-out environment. Higher external contamination of the birds and the litter at the end of the grow-out was associated with increased likelihood of Salmonella in the ceca of birds arriving for processing. Higher external contamination of the birds in grow-out and at arrival for processing also led to increased likelihood of contaminated carcasses entering the immersion chill tank. A certain proportion of Salmonella-positive crops may be established in broiler flocks at grow-out and contribute to an increased frequency of birds with Salmonella-positive crops arriving at the plant, which in turn can lead to higher likelihood of post-chill Salmonella-contaminated carcasses. The best predictors of broiler flock Salmonella status post-chill in this study were the frequency of Salmonella in the litter at harvest time and prior to placement. Likelihood of Salmonella contamination of the litter at harvest was associated with Salmonella status of the broiler flock, but not with the status of the litter prior to the placement. Variability among the grow-out farms, but not that among production complexes or companies, appeared to contribute to variability in Salmonella status of the broiler flocks at the end of the grow-out, upon arrival at the plant, and immediately before and after the immersion chill tank.
James Allen Byrd
Zoonoses and public health 2009 12 1 v.57
Journal Articles, USDA Authors, Peer-Reviewed
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