Synopsis The effect on the growth of Salmonella infantis in the caeca of chicks pre‐treated with either the cultured flora of the alimentary tract of an adult chicken, horse faeces or bovine rumen fluid was studied. Forty 2‐d‐old chicks were inoculated orally with S. infantis. Pre‐treatment with the cultured flora of the alimentary tract of an adult chicken as well as fluids from the alimentary tract prevented the colonisation of the caeca by S. infantis. The numbers of salmonella isolated from the caeca of all chicks with no pre‐treatment were more than 107 per g. Bovine rumen fluid and horse faeces were ineffective in preventing the caeca of chicks being colonised by S. infantis.
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Rantala et al. (1973) studied this question.
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