Emission of GHG from livestock production in Japan

Methane (CH4) and nitrous oxide (N2O) are main GHG emitted from livestock production. In the estimation based on dry matter intake, total emission from enteric fermentation is 0.375 million tons annually in Japan. Animal effluent which is another source of methane from animals corresponds to 22.7% of total amount of methane emission. Total emission of N2O–N from animal effluent in Japan was estimated to be 8.7867 Gg year− 1. According to the IPCC report (1995), the total N2O–N emission is estimated 1500 Gg year− 1 in the world. Thus, N2O emission from Japanese animal agriculture accounts 0.59% in the global emission. As 0.717 Tg nitrogen year− 1 have been excreted from the livestock in Japan, the excretion accounts 0.71% in 101  Tg year− 1 of total nitrogen excretion from the livestock. Relatively lower nitrogen excretion as N2O can be calculated in Japan.