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

P. R. Davies, W. E.M. Morrow, F. T. Jones, J. Deen, P. J. Fedorka-Cray, I. T. Harris

Research output: Contribution to journalArticlepeer-review

100 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)237-244
Number of pages8
JournalEpidemiology and infection
Volume119
Issue number2
DOIs
StatePublished - Oct 1997

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