The invention relates to a method for reducing the emission of methane, and possible other carbonaceous gasses being produced during processing of feed in the bowel of livestock, into the atmosphere. The method comprises feeding the livestock with feed comprising solid carbonaceous matter, the livestock digesting the feed, methane and possible other carbonaceous gasses being encapsulated within the structure of said carbonaceous matter, the livestock moving bowels with faeces, the methane and possible other carbonaceous gasses being encapsulated in the voids of the solid carbonaceous matter also after the livestock have made bowels with the faeces. The invention further relates to an animal feed composition comprising solid carbonaceous matter having voids within the structure of the matter, and to a method and an apparatus for producing such animal feed composition.
