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United States Department of Agriculture

Agricultural Research Service

Title: Effect of Challenge Time and Dosage on Salmonella Crop and Cecal Colonization in Broiler Chicks Following Treatment with a Characterized Competitive Exclusion Culture

Authors
item Hume, Michael
item Corrier, Donald
item Nisbet, David
item Deloach, John

Submitted to: Poultry Science Association Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: November 25, 1995
Publication Date: N/A

Technical Abstract: Broiler chicks were treated by oral gavage on the day of hatch with a characterized competitive exclusion continuous-flow culture (CF3) of cecal bacteria. Treated and untreated chicks were challenged with Salmonella typhimurium at 1 h after the CF3 treatment and at 3, 5, and 10 days of age to determine the time after treatment that CF3 is effective against Salmonella crop and cecal colonization. Crops were aseptically collected at 4 h after each challenge, while ceca were taken from additional chicks at 48 h after challenge, and cultured for Salmonella. Salmonella crop colonization in chicks challenged at 3 days of age was reduced (P<0.01) within 4 h after challenge from 70% in the controls to 20% in the CF3- treated chicks. Salmonella cecal colonization in chicks challenged at 5 days of age was reduced (P</-0.05) in the treated chicks compared to controls and the population of Salmonella decreased (P<0.001) within 48 h after challenge from log10 5.9 Salmonella CFU in the controls to log10 1.2 CFU in the treated chicks. The results indicate that crop and cecal colonization by Salmonella were markedly and rapidly reduced in CF3- treated chicks.

Last Modified: 11/26/2014
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