Advance in enteric and manure-derived methane emissions from domestic animals

Enteric and manure-derived methane emissions from domestic animals around the world per year now are above 1／4 of total methane emissions. Methane, a principle greenhouse gas, can damage the ozonosphere. Methane emissions mitigation not only can improve utilization of feed energy, but also meliorate environment. This article reviews the influencing factors of methane emissions, methods used to measure enteric and manure-derived methane emissions from domestic animals. On the bases of these, advices on how to readuce the methane emission from enteric and manure are given.