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Asian-Australas J Anim Sci > Volume 21(1); 2008 > Article
Review Paper
Asian-Australasian Journal of Animal Sciences 2008;21(1): 144-154.
DOI: https://doi.org/10.5713/ajas.2008.r01    Published online January 4, 2008.
Control of Rumen Microbial Fermentation for Mitigating Methane Emissions from the Rumen
Makoto Mitsumori*, Weibin Sun
Correspondence:  Makoto Mitsumori,
Abstract
The rumen microbial ecosystem produces methane as a result of anaerobic fermentation. Methanogenesis in the rumen is thought to represent a 2-12% loss of energy intake and is estimated to be about 15% of total atmospheric methane emissions. While methanogenesis in the rumen is conducted by methanogens, PCR-based techniques have recently detected many uncultured methanogens which have a broader phylogenetic range than cultured strains isolated from the rumen. Strategies for reduction of methane emissions from the rumen have been proposed. These include 1) control of components in feed, 2) application of feed additives and 3) biological control of rumen fermentation. In any case, although it could be possible that repression of hydrogen-producing reactions leads to abatement of methane production, repression of hydrogen-producing reactions means repression of the activity of rumen fermentation and leads to restrained digestibility of carbohydrates and suppression of microbial growth. Thus, in order to reduce the flow of hydrogen into methane production, hydrogen should be diverted into propionate production via lactate or fumarate.
Keywords: Methane; Rumen; Rumen Microorganisms; Methanogens


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