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Measurement of Greenhouse gas Emission from Naturally Ventilated Dairy Cattle Buildings

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2012 IX International Livestock Environment Symposium (ILES IX)  ILES12-0432.(doi:10.13031/2013.41626)
Authors:   Chaoyuan Wang, Baoming Li, Zhengxiang Shi, Wei Cao, Dongmei Luan, Guoqiang Zhang
Keywords:   Keywords: Dairy, Greenhouse Gas, Emission, Naturally Ventilated Dairy Cattle Building

Field measurements were carried out for 11 naturally ventilated dairy cattle buildings with different floor types and manure handling systems in Denmark and China. Inside and outside CO2, CH4 and N2O concentrations were continuously measured at the representative locations of the buildings. Based on the estimation of CO2 production of the housed animals, a CO2 mass balance method was used to determine air exchange rate of the naturally ventilated buildings. During the measurement period, the overall CH4 emission rate from the dairy cattle buildings was averaged 246 g HPU-1 d-1 with a standard deviation of 44.6 g HPU-1 d-1, largely changing within the range of 200 to 300 g HPU-1 d-1. The overall mean emission rate of N2O from the investigated buildings was approximately 1.60.26 g HPU-1 d-1. The results indicated that CH4 emission rates did not vary greatly for the measurements, and its emission was not affected by floor types or ambient temperatures. Large variations in N2O emission rates were not observed in similar buildings. Significant differences were found on CH4 and N2O emissions from the dairy buildings in Denmark and China, which might because of the difference in cows production levels.

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