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Drinking Water Delivery of a Defined Competitive Exclusion Culture (Preempt) in 1-Day-Old Broiler Chicks

MS BioScience, Inc., Madison WI 53704; Phone: (608) 241-2643; FAX: (608) 241-2644

Nancy Keith and John R. Deloach

Keith Associates, Springfield, MO 65804

Correspondence: Charles Martin

Competitive exclusion bacteria must colonize the intestinal tract of the chicken in order to protect the chicken from colonization by Salmonella. Typically, these beneficial bacteria are introduced into the gut by ingestion as the chick preens after a spray application of the bacterial suspension at the hatchery. As an alternative to spray application, competitive exclusion bacteria were introduced to 1-day-old broiler chicks through drinking water. Various concentrations were added to the drinking water to determine the optimum concentration of the competitive exclusion culture. The optimum level was determined by comparing cecal content propionic acid levels and Salmonella reduction in the ceca with competitive exclusion culture dosage amounts. Two replicate trials were conducted. The administration of 7.0 log CFU/chick of the competitive exclusion culture resulted in excellent protection from Salmonella colonization. This dose of the culture is the same as that currently recommended for spray application (MS BioScience, Madison, WI).

Key Words: Broiler chicken • competitive exclusion • Salmonella