Submitted to: Mexican Association of Poultry Scientists Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 5/5/1996
Publication Date: N/A
Citation: Interpretive Summary:
Technical Abstract: Studies were conducted to evaluate the protective effect of titrated dosages of a characterized competitive exclusion (CE) culture administered by automated spray treatment of Salmonella colonization in broiler chicks. One-day-old chicks were divided into four groups of 100 each and spray- treated with distilled water (controls) or with titrated dosages of CE culture that contained 10**6, 10**7, or 10**8 anaerobic bacteria per dose per chick, respectively. Fifty chicks in each group were challenged orally with 10**4 S. typhimurium on day 3 and designated as seeders. The remaining 50 chicks in each group were designated as nonchallenged contacts to evaluate the horizontal spread of Salmonella within each group. On day 10, the cecal contents from 20 seeder and 20 contact chicks in each group were cultured for Salmonella. Compared with controls, treatment with dosages containing 10**6, 10**7, or 10**8 anaerobic bacteria decreased (P<.05) both the incidence and population of Salmonella in the cecal contents of the seeder birds and the horizontal spread of Salmonella to contact birds. Resistance to Salmonella in the CE treated chicks was dosage related and further enhanced at the 10**7 and 10**8 dosages compared with the 10**6 dosages.