Although there are many unknown portions, about 5% of CH., and about 30% of N2O anthropogenic generation sources, are presumed to be of livestock excrement origin, and the curtailment is expected. However, in actual cases in which the amounts generated were in a real porcessing facility, there was a great disparity in the value obtained. The amount of gas generated from actual treatment processing must be measured more exactly, and generating factors must be analyzed.