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The effect of yeast culture on rumen fermentation: Growth of the yeast in the rumen and the requirement for viable yeast cells

  • S.M. El Hassan (a1), C.J. Newbold (a1) and R.J. Wallace (a1)

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Yeast culture (YC) based on Saccharomyces cerevisiae has been reported to stimulate bacterial activity within the rumen, leading to increases in ruminal fibre digestion and microbial protein flow from the rumen (Wallace and Newbold, 1992). Dawson (1987) suggested that S. cerevisiae might grow in the rumen. Newbold et al (1990) found no evidence for the growth of S. cerevisiae in the rumen of sheep when the numbers of live yeast in the rumen were measured at various times after a diet contain YC had been consumed. The current experiment was designed to investigate further the possibility that S. cerevisiae grows in the rumen and to establish the importance of viable yeast cells in the action of YC in the rumen.

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Dawson, K.A. 1987. Mode of action of the yeast culture, Yea-Sacc, in the rumen: A natural fermentation modifier. In: Biotechnology in the Feed Industry, (ed Lyons, T.P.), pp. 119–125. Alltech Technical Publications, Nicholasville, Kentucky.
Newbold, C.J., Williams, P.E.V., McKain, N., Walker, A. and Wallace, R.J. 1990. The effects of yeast culture on yeast numbers and fermentation in the rumen of sheep. Proceedings of the Nutrition Society, 49, 47A (Abstract).
Wallace, R.J. and Newbold, C.J. 1992. Probiotics for Ruminants. In: Probiotics: The Scientific Basis, (ed Fuller., R.) pp 317–353, Chapman and Hall: London.

The effect of yeast culture on rumen fermentation: Growth of the yeast in the rumen and the requirement for viable yeast cells

  • S.M. El Hassan (a1), C.J. Newbold (a1) and R.J. Wallace (a1)

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