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Effect of Simultaneous or Delayed Competitive Exclusion Treatment on the Spread of Salmonella in Chicks

USDA-ARS, Food Animal Protection Research Laboratory, 2881 F&B Road, College Station TX 77845; Phone: (409) 260-9484; FAX: (409) 260-9332

Correspondence: D. E. Corrier

Exposure of newly hatched chicks in the hatchery to salmonellae results in the establishment of seeder chicks with fecal shedding and the transmission of salmonellae to other contact chicks in the broiler house during growout. This study investigated the protective effect of treatment with a characterized competitive exclusion culture, CF3 on the transmission of Salmonella from seeder to contact chicks when CF3 treatment occurred simultaneously with seeder challenge or when treatment was delayed until 24 hr after challenge. Delayed treatment failed to prevent the establishment of seeder chicks, but did significantly (P. 005) reduce the spread of Salmonella from seeder to non-challenged contact chicks. Simultaneous Salmonella challenge and CF3 treatment significantly (P. 005) decreased the establishment of seeders and was highly effective in preventing the spread of Salmonella from seeder to contact chicks. The results demonstrated that treatment on the day of hatch can significantly help to reduce seeder establishment and the spread of Salmonella from seeders to highly susceptible contact chicks.

Key Words: Chick • competitive exclusion • salmonellae • transmission