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Appl Environ Microbiol. 1981 October; 42(4): 649-655

Role of Megasphaera elsdenii in the Fermentation of DL-[2-13C]lactate in the Rumen of Dairy Cattle

G. H. M. Counotte1, R. A. Prins1,{dagger}, R. H. A. M. Janssen2 and M. J. A. DEBie2

1 Laboratory of Animal Nutrition, Zootechnical Department, State University of Utrecht, Utrecht, The Netherlands
2 Laboratory of Organic Chemistry, State University of Utrecht, Utrecht, The Netherlands

ABSTRACT

Since Megasphaera elsdenii ferments a variable part of DL-lactate to butyrate, measurement of the percentage of DL-lactate fermented to propionate via the acrylate pathway in rumen contents will underestimate the participation of M. elsdenii in the DL-lactate fermentation. The percentage of DL-[2-13C]lactate fermented via the acrylate pathway and the percentage of DL-lactate fermented to butyrate can be measured with 13C-FT (Fourier transform)-nuclear magnetic resonance. On the average, the contribution of M. elsdenii to DL-lactate fermentation in the rumen of dairy cattle was found to be 74% (standard deviation, 13%), but differed with animal or diet. After feeding a cow readily fermentable carbohydrates, the contribution of M. elsdenii to the fermentation of DL-lactate increased as a consequence of catabolite repression in other DL-lactate-fermenting bacteria.


FOOTNOTES

{dagger} Present address: Department of Bacteriology, University of California, Davis, CA 95616.


Appl Environ Microbiol. 1981 October; 42(4): 649-655




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