Greenhouse gas emissions from pig and poultry production sectors in China from 1960 to 2010

Pig and poultry production in China had experienced considerable changes from 1960 to 2010.The present study aimed to evaluate the effects of these changes on greenhouse gas emission inventories（expressed as CO;equivalent） from these two sectors.The inventories included methane emissions from enteric fermentation,methane and nitrous oxide production from manure management.The greenhouse gas emissions from these sources in 2010 in pig sector were17,62 and 21%,respectively,and that in poultry sector（including chicken,duck,goose and others） were 1,18 and 81%,respectively.Total CO;equivalent increased from 1960 to 2010 in both pig(11 582 to 55564 Gg yr;) and poultry(1 497 to14 873 Gg yr;) sectors.Within poultry sector,emissions from chicken,duck,goose and others accounted for 74,15,11 and 0.01%in 2010,respectively.However,during the last 50 years,these emissions continuously reduced when related to production of 1 kg of pork(8.01 to 1.14 kg kg;),poultry meat(1.19 to 0.37 kg kg;) and egg(0.47 to 0.33 kg kg;),which is mainly associated with the continuous improvement in production efficiency in all management systems.These results provide benchmark information for Chinese authorities to develop appropriate policies and mitigation strategies to reduce greenhouse gas emissions from pig and poultry sectors.