Fig. 2From: Alternative pathways for hydrogen sink originated from the ruminal fermentation of carbohydrates: Which microorganisms are involved in lowering methane emission?Scheme of rumen carbohydrate fermentation pathways into volatile fatty acids (bold lined boxes) and other intermediate metabolites. The rumen H2 sink pathways are displayed: reductive acetogenesis (1), methanogenesis (2), sulfate reducers (3), and nitrate reducers (4)Back to article page