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Asian-Australas J Anim Sci > Volume 18(6); 2005 > Article
Animal Products
Asian-Australasian Journal of Animal Sciences 2005;18(6): 873-878.
DOI: https://doi.org/10.5713/ajas.2005.873    Published online November 26, 2005.
Assessment of Greenhouse Gas Emissions from Poultry Enteric Fermentation
Shu-Yin Wang, Da-Ji Huang
Abstract
Emissions of nitrous oxide (N2O) and methane (CH4) from poultry enteric fermentation were investigated using a respiration chamber. Birds were placed in a respiration chamber for certain intervals during their growing period or for the whole life cycle. The accumulated gas inside the chamber was sampled and analyzed for N2O and CH4 production. A curve for gas production during a life cycle was fitted. The calculated area under the curve estimated the emission factor of poultry enteric fermentation on a life cycle basis (mg bird-1 life cycle-1). This method can be used to estimate CH4 or N2O emissions from different types of avian species taking into account factors such as diet, season or thermal effects. The CH4/N2O emission factors estimated for commercial broiler chickens, Taiwan country chickens and White Roman Geese were 15.87/0.03, 84.8/16.4 and 1,500/49 (mg bird-1 life cycle-1), respectively, while the calculated CH4/N2O emission from enteric fermentations were 3.03/0.006, 14.73/2.84 and 9.5/0.31 (Mg year-1), respectively in Taiwan in the year of 2000. The described method is applicable to most poultry species and the reported emission factors were applicable to meat type poultry only.
Keywords: Nitrous Oxide; Methane; Respiration Chamber; Enteric Fermentation; Emission Factors
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