Journal
ANIMAL FEED SCIENCE AND TECHNOLOGY
Volume 166-67, Issue -, Pages 113-121Publisher
ELSEVIER
DOI: 10.1016/j.anifeedsci.2011.04.060
Keywords
Methanogens; Methane; Bulls; mcrA; qPCR; DGGE
Categories
Funding
- regional council of the French Centre region
- McKey Food Services (Fleury les Aubrais, France)
- Valorex (Combourtille, France)
- INRA - Region Auvergne scholarship
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Methanogenesis plays an important role in maintaining low hydrogen partial pressure in the rumen and consequently in feed digestion. Diet composition and lipid supplementation are known to influence the extent of methane (CH4) production in ruminants. However, the impact of diet composition on rumen methanogens is poorly understood. This study examined CH4 production and methanogen community abundance, diversity and metabolic activity in the rumen of fattening bulls fed a fibrous diet (F; n = 10) or a starch rich diet supplemented with extruded linseed (SL; n = 10). Net CH4 emissions from bulls fed SL were lower than emissions from bulls fed F. Methanogenic Archaea were studied using culture independent methods targeting the functional mcrA gene. Methanogen abundance was similar in the two groups of bulls, but protozoa numbers were 65% lower in the F group. The SL diet decreased methanogen diversity and metabolic activity, which were evaluated by PCR-DGGE and reverse transcriptase qPCR, respectively. In contrast, no changes occurred in bacterial numbers and diversity between diets. Data indicate that reduction in net CH4 production with the SL diet was associated with changes in rumen microbiota, particularly methanogen activity. Characterization of the activity and structure of the whole rumen microbiota should provide a better prediction of methanogenesis. This paper is part of the special issue entitled: Greenhouse Gases in Animal Agriculture Finding a Balance between Food and Emissions, Guest Edited by T.A. McAllister, Section Guest Editors: K.A. Beauchemin, X. Hao, S. McGinn and Editor for Animal Feed Science and Technology, P.H. Robinson. (C) 2011 Elsevier B.V. All rights reserved.
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