Monitoring and evaluation of global warming gas derived from dairy cow under heat stress

奶牛对高温非常敏感，因此有必要采取应对全球变暖的措施。另一方面，奶牛身体产生的甲烷气体，估计占全球排放量的25%，是农业中水稻种植的主要来源。为了揭示热应激对奶牛生理状态下甲烷和二氧化碳排放的影响，利用二氧化碳气体分析仪构建了监测系统。动态室法应在一定的流动条件下运行，否则应在夜间进行流体分析，以提高气体通量评估的准确性。

The dairy cow is so heat stress-sensitive that countermeasures against recent global warming should be necessary in dairy farming. On the other hand, methane gas derived from dairy cow body, estimated to be 25% of global emission, is the major source along with the paddy rice cropping in agriculture. In order to reveal the influence of heat stress on methane and the carbon-dioxide emissions, which are exerted by the physiology state of a dairy cow, the monitoring system was constructed by using a carbon dioxide gas analyzer. The dynamic chamber method should be operated as far as certain flow conditions, otherwise a fluid analysis should be used during the night time to enhance the accuracy of the gas flux evaluation.