EFFECT OF ENVIRONMENTAL TEMPERATURE ON SUSCEPTIBILITY OF YOUNG CHICKENS TO SALMONELLA TYPHIMURIUM |
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Authors: | A. S. Soerjadi J. H. Druitt A. B. Lloyd R. B. Cumming |
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Affiliation: | Faculty of Rural Science, University of New England, New South Wales, 2351 |
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Abstract: | Day-old chickens kept in a cold environment (18 degrees to 22 degrees C) were more susceptible to a low and moderate challenge of Salmonella typhimurium than chickens similarly challenged and kept in a warm environment (32 degrees to 36 degrees C). Cold stress at 10 degrees C for 24 h when applied to 12-day-old chickens effectively increased the number of birds shedding organisms. However a similar cold stress on 20-day-old chickens resulted in a less dramatic increase in the number of birds shedding organisms. Of the 60 birds previously challenged with S. typhimurium and then subjected to cold stress, 16 birds recommenced shedding and 7 birds with no previous history of shedding began to shed organisms. |
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