Changes in the microbial population of a rumen-simulating fermenter in response to yeast culture

C. J. Newbold, F. M. McIntosh, R. J. Wallace

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Yeast increased the total viable count of bacteria on a medium containing rumen fluid and soluble sugars by 38% (P <0.05) and the cellulolytic population increased by 49%, although the increase was not statistically significant (P > 0.05). Microscopic counts indicated a 25% increase in total bacteria (P <0.05). Bacterial counts with mannitol as sole energy source also increased (P <0.05), indicating an increased Selenomonas population; that was not in itself sufficient to account for the increase in the total bacterial count. The protozoal population was significantly lower in yeast supplemented vessels (P <0.001), which may account partly for the increased bacterial numbers.
Original languageEnglish
Pages (from-to)241-244
Number of pages4
JournalCanadian Journal of Animal Science
Issue number2
Publication statusPublished - 1 Jun 1998


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