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Factors influencing salmonella shedding in broiler chickens

Published online by Cambridge University Press:  19 October 2009

R. H. Gustafson  and
J. D. Kobland
R. H. Gustafson
Affiliation:
Agricultural Research Division, American Cyanamid Company, Princeton, NJ08540
J. D. Kobland
Affiliation:
Agricultural Research Division, American Cyanamid Company, Princeton, NJ08540
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Three variables were included in a study to determine their effect on the incidence of Salmonella typhimurium in broilers challenged at four days of age. Variables included the presence or absence of a feed additive, avoparcin; the use of new or used litter and the initiating dose of salmonella. Cloacal swabs were taken from approximately 600 chicks at weekly intervals for 45 days. At 104, 106 and 108 c.f.u./chick there was a direct association of challenge dose and the incidence of positive chicks for the first several weeks. Chicks raised on used litter showed an appreciable reduction in susceptibility to salmonella when compared to control animals on fresh litter. As the birds approached slaughter age, the influence of litter hygiene and challenge dose diminished under the conditions of this study. Avoparcin in the diet at 10 p.p.m. had no enhancing effect on salmonella shedding at any time during the 45-day sampling period. The implications of competitive exclusion are discussed.

Type
Research Article
Information
Journal of Hygiene , Volume 92 , Issue 3 , June 1984 , pp. 385 - 394
Copyright
Copyright © Cambridge University Press 1984

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