Livestock and poultry excretion emission(reference)
The amount of fecal excretion of livestock and poultry is related to many factors such as animal species, variety, sex, growth period, feed and even weather.
Tables 1 and 2 list the daily emission factors and annual discharges of livestock manure.
The amount of fecal resources in China’s livestock and poultry breeding industry
The livestock manure contains a large amount of nutrients such as NP, which is a nutrient-rich organic fertilizer raw material. For a long time, Chinese farmers have always used livestock and poultry manure as raw materials to improve soil fertility. Livestock and poultry manure is an important valuable resource for ensuring the sustainable development of China’s agriculture. Table 3 shows that China’s livestock and poultry manure production is very large, with an annual output of about 1.73 billion tons, including 1.07 billion tons of cow dung, 270 million tons of pig manure, 340 million tons of sheep manure, 180 million tons of poultry manure, and total livestock manure. N contains 15.97 million tons, P is 3.63 million tons. Compared with the amount of chemical fertilizer applied in China in 1995 (equivalent to N, P, and K are 20.219 million and 6.324 million tons respectively), the N and P contents in livestock manure are equivalent. In China, the amount of chemical fertilizer applied was 78.9% and 57.4%.