Abstract
The effect of oral inoculation with a defined culture of cecal bacteria and provision of dietary lactose on colonization resistance to invasive Salmonella enteritidis was evaluated in leghorn chicks. A defined mixed culture composed of 11 indigenous cecal bacteria capable of utilizing lactose or lactose fermentation products as a primary carbon source was isolated and maintained in continuous-flow culture. Combined treatment with the defined culture and dietary lactose significantly decreased (P < 0.01) the number of Salmonella in the cecal contents and the number of Salmonella cecal-culture-positive chicks in four replicated trials. Additionally, Salmonella colonization of the spleen, liver, and cecal tonsils was significantly decreased (P < 0.05) in each of the trials. The results indicate that the resistance of leghorn chicks to S. enteritidis cecal and organ colonization is effectively increased by inoculation with a defined culture of cecal bacteria and provision of lactose in the diet.
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