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Wu Xiao, director of the Rural Economics Department of the National Development and Reform Commission of China, pointed out that the total amount of livestock and poultry produced in China is nearly 4 billion tons per year, and the chemical oxygen demand of livestock and poultry farming has reached 12.68 million tons, accounting for agricultural sources. 96% of the total is an important cause of agricultural non-point source pollution. As the farming method shifts from family free-range to large-scale farming, the amount of farming is growing rapidly, and environmental problems such as agricultural non-point source pollution caused by livestock and poultry manure are becoming more and more prominent. Wu Xiao said, "If it can be effectively disposed and used rationally, livestock and manure will become a valuable resource."