Impact of By-product Feedstuffs on Escherichia coli O157:H7 and Salmonella Typhimurium in Pure and Mixed Ruminal and Fecal Culture in Vitro

Published 10/2012

volume 2 issue 2
Pp. 139-148

Keywords: , , , , , ,


The use of by-product feedstuffs and prebiotics in animal diets has increased in recent years.  The present study was undertaken to determine what effects novel by-product feedstuffs, including prebiotics, have on survival of the important foodborne pathogenic bacteria Escherichia coli O157:H7 and Salmonella enterica Typhimurium in pure and mixed ruminal and fecal culture fermentations from cattle and swine.   By-product feedstuffs utilized in this study included: hyperimmunized whole egg, lysine biomass, lysine biomass (spray dried), threonine biomass (drum dried), threonine biomass (spray dried), beer well yeast (drum dried), beer well yeast (spray dried), ethanol yeast (pan dried) and corn meal as a control to simulate normal dietary conditions.  Prebiotics examined included: PremiDex ™, CitriStim™, a CitriStim:PremiDex blend (50%:50%), and a commercial oligosaccharide source feedstuff.  Pure culture populations of E. coli O157:H7 were reduced (P < 0.05) by 2% w/v of each of spray dried threonine, drum-dried threonine, ethanol yeast, hyper-immunized whole egg, and a blend of CitriStim:PremiDex.  No effects on Salmonella populations were observed in pure cultures.  Fermentations of mixed ruminal microorganisms from cattle fed a forage based diet demonstrated that 2% PremiDex reduced (P < 0.05) E. coli O157:H7 populations compared to controls i and the CitriStim:PremiDex blend reduced E. coli O157:H7 and Salmonella populations (P < 0.05) in fermentations from cattle fed high grain diets.  The anti-foodborne pathogen effects appear to be an indirect effect mediated by the microbial population of the intestinal tract, such as has been reported previously for prebiotics.

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