The comprehensive utilization of cow dung is more cost-effective than raising and selling cattle.

Wang Shuizhang in Zhengzhou City, Henan Province, built an ecological park. In this ecological park, Wang Shuizhang raised both chickens and aquatic products, planted fruit trees and vegetables, and made a variety of benefits, all due to a common agricultural waste-cow dung.

Wang Shuizhang is a beef cattle farmer, raising 1000 cattle. In the past, the farm was full of cow dung, cow urine and smelly. The cow dung everywhere could not be disposed of and polluted the environment, so Wang Shuizhang collected all the cow dung and urine and built a biogas digester. With a biogas digester, the produced biogas can cook, use it, and generate electricity, which costs no money for cooking and electricity.

The biogas produced by the fermentation of cow dung was used, but there was too much biogas residue left. Wang Shuizhang used his brains to dilute the biogas slurry and raised the Loach that was resistant to sewage and hypoxia. After touching the cable, he has mastered the appropriate proportion of biogas slurry use, and the growth rate of the Loach raised by him is 20% faster than that of the ordinary breeding method. Now the Loach is in short supply, which is not only sold at home, but also exported to South Korea, Japan and other places. Moreover, Loach itself is a relatively high economic value of aquatic products, the price is more expensive, farming an acre of Loach can earn at least 20,000 yuan.

In Misgurnus anguillicaudatus culture, the old water will be replaced at regular intervals, and a certain proportion of new water diluted with biogas slurry will be added to ensure the content of nutrients in the water. Wang Shuizhang did not waste the old water that had been replaced, but raised silver carp and silver carp. And if you don't feed anything, the fish will grow big and good. Now Wang Shuizhang has an extra income. And the water in the fish ponds can be reused, using them to irrigate the land saves both water and fertilizer. With the full comprehensive utilization of cow manure after fermentation, the benefit will be more than 20 times that of cattle breeding.