Certain types of microbes in the stomachs of ruminant livestock cause these animals to produce methane during the digestive process. In New Zealand, methane generated by the sheep farming industry accounts for 43 % of the total volume of methane produced by that country. Agriculture experts are already searching for forage additives that will control microbes of that type.
由於反芻動物胃部的微生物會造成動物打嗝時排放甲烷，在紐西蘭，綿羊製造的甲烷就佔該國總量的百分之四十三，農業人員已努力尋找能抑制該種微生物的草料添加劑。