Abstract
The prevalence of Campylobacter (>90%) and Salmonella (33%) in turkeys at slaughter has been estimated. This report describes studies to estimate the time of entry of Campylobacter and Salmonella into the brooder house, which is the first stage of commercial turkey production. In trial 1, birds (∼100 per time point) were monitored by conventional culture at three intervals (0, 9, and 16 days of age). Campylobacter spp. were not detected in poults at the day of hatch; Salmonella was isolated from the ceca (3.9%) and yolk sac (0.1%). By day 9, Salmonella were frequently isolated from the ceca (55%) and small intestine (45%) while Campylobacter was not cultured. By day 16, the prevalence of Salmonella in the ceca (21%) and small intestine (5.1%) had declined; Campylobacter was infrequently isolated from either the ceca (2%) or small intestine (3%). In trial 2, poults (50 per time point at 5, 20, and 33 days of age) were monitored for Campylobacter and Salmonella by real-time polymerase chain reaction (PCR); Salmonella was also monitored by conventional culture. Whereas Campylobacter was not detected by real-time PCR in the ceca of 5-day-old birds, it was detected on days 20 (92%) and 33 (90%). In contrast, Salmonella was isolated from young birds at days 5 (98%), 20 (98%), and 33 (98%), after which time the turkeys were moved to the finisher house. At slaughter at 138 days, Salmonella prevalence in the ceca had declined (4.5%) in contrast to the prevalence of Campylobacter (92%). Antimicrobial sensitivity profiles of the Salmonella isolates indicated an increase of sulfonamide-resistant isolates throughout the brooder stage. Genotyping by pulsed-field gel electrophoresis analysis of Salmonella (45 isolates per sampling time) indicated fluctuating populations as the birds matured.
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Acknowledgements
We acknowledge the technical expertise of Ms. Rachel Pinney and Ms. Roxanne Taylor for conducting the real-time PCR analyses. We are indebted to the turkey producers for access to their brooder flocks and to their birds at slaughter. We thank Jan Eifling for the literature search and Linda Miller for the secretarial assistance. We are grateful to Mr. Timothy Klinefelter, Iowa State University Veterinary Diagnostic Laboratory, for providing the 2007 avian Salmonella antibiograms. We acknowledge the critical comments of Drs. Thomas Casey, S. Bhaduri, and R. Kunkle, which improved this manuscript.
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Wesley, I.V., Muraoka, W.T. Time of Entry of Salmonella and Campylobacter into the Turkey Brooder House. Food Bioprocess Technol 4, 616–623 (2011). https://doi.org/10.1007/s11947-009-0190-2
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DOI: https://doi.org/10.1007/s11947-009-0190-2