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

G. H. M. Counotte | Zendy; R. A. Prins | Zendy; Richard H.A.M. Janssen | Zendy; M. J. A. deBie | Zendy

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

Author(s) -

G. H. M. Counotte,

R. A. Prins,

Richard H.A.M. Janssen,

M. J. A. deBie

Publication year - 1981

Publication title -

applied and environmental microbiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.552

H-Index - 324

eISSN - 1070-6291

pISSN - 0099-2240

DOI - 10.1128/aem.42.4.649-655.1981

Subject(s) - fermentation , propionate , rumen , butyrate , silage , lactic acid , ethyl lactate , food science , chemistry , lactic acid fermentation , biochemistry , biology , bacteria , genetics , catalysis

SinceMegasphaera elsdenii ferments a variable part ofdl -lactate to butyrate, measurement of the percentage ofdl -lactate fermented to propionate via the acrylate pathway in rumen contents will underestimate the participation ofM. elsdenii in thedl -lactate fermentation. The percentage ofdl -[2-13 C]lactate fermented via the acrylate pathway and the percentage ofdl -lactate fermented to butyrate can be measured with13 C-FT (Fourier transform)-nuclear magnetic resonance. On the average, the contribution ofM. elsdenii todl -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 ofM. elsdenii to the fermentation ofdl -lactate increased as a consequence of catabolite repression in otherdl -lactate-fermenting bacteria.

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