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Prevalence of salmonella in finishing swine raised in different production systems in North Carolina, USA

Published online by Cambridge University Press:  01 October 1997

P. R. DAVIES
Affiliation:
Department of Food Animal and Equine Medicine, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606
W. E. M. MORROW
Affiliation:
Department of Animal Science, College of Agriculture and Life Sciences, North Carolina State University, Raleigh, NC 27606
F. T. JONES
Affiliation:
Department of Poultry Science, College of Agriculture and Life Sciences, North Carolina State University, Raleigh, NC 27606
J. DEEN
Affiliation:
Department of Food Animal and Equine Medicine, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606
P. J. FEDORKA-CRAY
Affiliation:
USDA-ARS- National Animal Disease Center, PO Box 70, Ames, IA 50010
I. T. HARRIS
Affiliation:
USDA-ARS- National Animal Disease Center, PO Box 70, Ames, IA 50010
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Abstract

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We compared the prevalence of salmonella in faecal samples from finishing pigs and in feed samples from swine herds in North Carolina, USA. Farms were either finishing sites using all-in/all-out management of buildings in multiple-site systems (14 farms) or farrow-to-finish systems using continuous flow management of finishing barns (15 farms). The two groups of herds differed with respect to several management variables. Salmonella were isolated from 565 of 2288 (24·6%) faecal samples and from at least 1 faecal sample on 24 of 29 (83%) farms. Predominant serotypes were S. derby, S. typhimurium (including copenhagen), S. heidelberg, S. worthington and S. mbandaka. Fewer farrow-to-finish farms were detected as positive compared with all-in/all-out farms. Prevalence was lower for pigs raised on slotted floors compared with all other floor types, and was highest for pigs raised on dirt lots. Modern methods of raising pigs in multiple-site production systems, using all-in/all-out management of finishing pigs, appear to have no benefit in reducing the prevalence of salmonella compared with conventional farrow-to-finish systems.

Type
Research Article
Copyright
© 1997 Cambridge University Press