Development of innovative rumen modifier to reduce methane production

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Cashew nut shell liquid, a novel rumen modifier, was evaluated for its potential to reduce methane from ruminant animals and possible mechanisms involved in it. The shell liquid selectively inhibited growth of several species of rumen bacteria to lead a dramatic shift of rumen microbiota. This resulted in rumen fermentation changes with less methane and more propionate production but without adverse effects on feed digestion and animal health. The feeding of shell liquid allowed more than 20% reduction of methane that had not been realized by any other modifiers. Therefore, future application of the shell liquid is highly expected.