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  Journal of Applied MicrobiologyVolume 94 Issue 2, Pages 207 - 213 Published Online: 15 Jan 2003 Journal compilation © 2010 The Society for Applied Microbiology The Official Journals of the Society for Applied Microbiology
Abstract | References | Full Text: HTML, PDF (Size: 158K) | Related Articles | Citation Tracking  *Mention of trade name, proprietary product, or specific equipment does not constitute a guarantee or warranty by the USDA and does not imply its approval to the exclusion of other products that may be suitable. †The research reported was conducted as part of the authors' official duties of the United States Department of Agriculture. Copyright 2003 The Society for Applied Microbiology KEYWORDS anti-microbial •
E. coli O157:H7 • foodborne pathogens • Ionophores •
Salmonella
t.s. edrington, t.r. callaway, p.d. varey, y.s. jung, k.m. bischoff, r.o. elder, r.c. anderson, e. kutter, a.d. brabban and d.j. nisbet. 2003.
Abstract
Aims: To examine the effects of ionophores on Salmonella and Escherichia coli O157:H7 in pure and mixed ruminal fluid cultures. Methods and Results: Four Salmonella serotypes (Dublin, Derby, Typhimurium, and Enteriditis) and two strains of E. coli O157:H7 (ATCC 43895 and FDIU 6058) were cultured in the presence of varying concentrations of ionophores (monensin, lasalocid, laidlomycin propionate, and bambermycin) in pure and mixed ruminal fluid cultures. Bacterial growth rates in pure culture were not affected (P > 0·10) by ionophores at concentrations up to 10 times the approximate rumen ionophore concentration under normal feeding regimens. Likewise, ionophores had no effect (P > 0·10) on Salmonella or E. coli CFU plated from 24-h ruminal fluid incubations. Ionophore treatment decreased (P < 0·01) the acetate : propionate ratio in ruminal fluid cultures as expected. Conclusions: Ionophores had no effect on the foodborne pathogens Salmonella and E. coli O157:H7 in vitro. Significance and Impact of the Study: The results suggest that ionophore feeding would have little or no effect on Salmonella or E. coli populations in the ruminant. | 
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