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Identifying potential risk factors to direct intervention strategies is fundamental to reduce the risk of pork contamination with Salmonella . This study was designed to compare the Salmonella prevalence in the first group of pigs selected for slaughter (uFirst pull") versus the last group of pigs selected for slaughter ("Close out") from typical commercial finishing barns containing 800 1,000 animals. Nine finishing barns from two production sites were included in the study {4 paired samplings from site A, and 5 paired samplings from site B). Each paired sampling consisted in matched groups of pigs from the same barn as the ufirst putr and the "close out" with a 4-week interval between groups. From each group, individual fecal samples (n = 45) and meat samples (n = 50) were collected, on-farm and at slaughter, respectively. In the laboratory, fecal samples were selectively enriched, and analyzed for the presence of Salmonella by a commercially available antigen-capture ELISA. Meat samples were kept frozen , and thawed for processing. The resulting liquid ("meat juice") was collected and analyzed for the presence of antibodies against Salmonella by a commercially available ELISA. All lots of pigs housed in the finishing barns studied were Sa/monel/a-positive, based on sampling from "first pull" and "close our. In 7/9 (77.8%) of the studied barns, an increase in Salmonella prevalence was observed, based on both bacteriologiC and serologic analysis. Overall , there was an increase of 9.3% (P<0.05) in bacteriologiC prevalence, and 25.1% (P<0.05) in serologic prevalence from "first pull" to "close out" groups. This study demonstrates that a significant increase of Salmonella prevalence occurs between the first and the last group of pigs from a finishing barn shipped to slaughter. In conclusion, "close out" groups of finishing pigs constitute a higher risk for Salmonella contamination of pork products.

Salmonella prevalence in "first pull" versus "close out" market pigs