J. Appl. Poult. Res.
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J APPL POULT RES 1998. 7:384-391
© 1998 Poultry Science Association
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Research Reports

Administering Mucosal Competitive Exclusion Flora for Control of Salmonellae

Mingwei Chen

Department of Food Science and Technology, The University of Georgia, Athens, GA 30602

Norman J. Stern, J. Stan Bailey and Nelson A. Cox

USDA, Agricultural Research Service, Russell Research Center, P. O. Box 5866, Athens, GA 30604-5677; Phone: (706) 546-3516; FAX: (706) 546-3771

Correspondence: Norman J. Stern, E-mail:nstern{at}ars.usda.gov

We compared three methods to administer various dilutions of mucosal competitive exclusion (MCE) culture to reduce Salmonella colonization in the intestinal tract of broiler chicks: 1) spraying onto the chicks using a "Newcastle" automatic spray cabinet; 2) directly gavaging in the crop of the chicks; and 3) a combination of spraying and gavaging the chicks. Day-of-hatch broiler chicks were provided selected treatments, or served as controls. A combination of strains of S. typhimurium, S. Montevideo, and S. California were used 4 hr after treatment to challenge the treated and control chicks. The chicks were sacrificed 5 days post challenge, and cecal contents were analyzed for the presence and numbers of the Salmonella isolates. The optimum level of MCE to reduce Salmonella colonization depended on the efficacy of the original MCE culture. A 10-6 dilution of freshly prepared MCE provided protection similar to the undiluted MCE that had been stored for more than 2 months. A combination of spraying and gavaging MCE was more effective than either of the two single treatment methods tested.

Key Words: Broilers • competitive exclusion • performance






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