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J. Dairy Sci. 88:2594-2600
© American Dairy Science Association, 2005.

Influence of Living and Autoclaved Yeasts of Saccharomyces boulardii on In Vitro Ruminal Microbial Metabolism

H. Oeztuerk1, B. Schroeder2, M. Beyerbach3 and G. Breves2

1 Department of Physiology, Faculty of Veterinary Medicine, University of Ankara 06110 Ankara, Turkey
2 Department of Physiology, and
3 Department of Biometry, Epidemiology and Information Processing School of Veterinary Medicine, Hannover, Germany

Corresponding author: Gerhard Breves; e-mail: gerhard.breves{at}tiho-hannover.de.

Experimental data on the effects of Saccharomyces boulardii on rumen microbial metabolism are scarce. The aim of this study was to examine whether S. boulardii had an effect on parameters of rumen microbial metabolism at different dosages and whether the yeast would be suitable as a probiotic agent for ruminants. To test whether the potential positive effects of S. boulardii could be attributed to the yeast’s viability or to its content of nutrients, living and autoclaved yeasts were tested simultaneously. For this purpose, incubation trials were carried out using the long-term rumen simulation technique. Living and autoclaved yeasts were added to fermentation vessels at a concentration of 0.5 or 1.5 g/d. The addition of living and autoclaved yeasts stimulated microbial metabolism, with no major differences between the treatments. It was concluded that ruminal microbes digested the supplied yeast of S. boulardii as an additional substrate and that S. boulardii, at least in ruminants, is utilized as a prebiotic rather than as a probiotic agent.

Key Words: Saccharomyces boulardii • yeast • ruminal microbial metabolism

Abbreviation key: SCFA = short-chain fatty acids.






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