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Salmonellas on pig farms and in abattoirs

Published online by Cambridge University Press:  15 May 2009

J. A. Lee ,
A. C. Ghosh ,
P. G. Mann  and
G. H. Tee
J. A. Lee
Affiliation:
Epidemiological Research Laboratory, Central Public Health Laboratory, Colindale Avenue, London, NW9 5HT
A. C. Ghosh
Affiliation:
Food Hygiene Laboratory, Central Public Health Laboratory, Colindale Avenue, London, NW9 5HT
P. G. Mann
Affiliation:
Public Health Laboratory, Royal United Hospital, Combe Park, Bath
G. H. Tee
Affiliation:
The Public Health Laboratory, Glyde Path Road, Dorchester
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Summary

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Salmonella infection on two pig farms and its relation to infection in pigs at slaughter was studied. On the first farm feed ingredients were mixed on the farm, and these included fish meal which was found to be contaminated with salmonellas. The feed was pumped to pigs in liquid form. There was a high salmonella isolation rate at slaughter when the contaminated fish meal was fed hi liquid feed, but it was significantly lower when no fish meal was fed to the pigs examined at slaughter. In some instances the same serotypes were found in fish meal and pig excreta on the farm and in caecal contents of the pigs at slaughter. No serotype was repeatedly isolated from any source and it appeared that the serotypes were not able to establish themselves in the pigs. It is concluded that infection found at slaughter originated on the farm where fish meal introduced and maintained infection. There was an opportunity for salmonellas to have multiplied in the liquid feed for several hours each day.

On a second farm environmental conditions were similar, but feed was given in the form of ready-made pellets and nuts. Salmonellas were not isolated from the feed. At slaughter there was a significantly lower isolation rate than on the first farm.

Type
Research Article
Information
Journal of Hygiene , Volume 70 , Issue 1 , March 1972 , pp. 141 - 150
Copyright
Copyright © Cambridge University Press 1972

References

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