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Estimation of methane and nitrous oxide emission from animal production sector in Taiwan during 1990-2000.

To investigate the greenhouse gases emissions from the feeding and waste management of livestock and poultry, methane and nitrous oxide emissions were estimated from the local measurement and IPCC guidelines during 1990-2000 in Taiwan. Hog is the major livestock and is followed by goat and cattle, while chicken is the major poultry and is followed by duck and geese. Methane emission from enteric fermentation of livestock was 30.9 Gg in 1990, increased to 39.3 Gg in 1996, and then decreased gradually to 34.9 Gg in 2000. Methane emission from the waste management was 48.5 Gg in 1990, reached the peak value of 60.7 Gg in 1996, and then declined to 43.3 Gg in 2000. In the case of poultry, annual methane emission from enteric fermentation and waste management was 30.6-44.1 ton, and 8.7-13.2 Gg, respectively. Nitrous oxide emission from waste management of livestock was 0.78 ton in 1990, increased to 0.86 ton in 1996, and then decreased to 0.65 ton in 2000. Nitrous oxide emission from waste management of poultry was higher than that of livestock with 1.11 ton in 1990, 1.68 ton in 1999, and 1.65 ton in 2000. There is an urgent need to reduce methane emission from enteric fermentation and recover methane from anaerobic waste treatment for energy in livestock and poultry feeding in Taiwan.[1]

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