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| Comparative study of pollutant production and the discharge coefficient of sheep under different feeding methods |
| Received:May 30, 2022 |
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| KeyWord:sheep|feeding method|pollutant production coefficient|pollutant discharge coefficient |
| Author Name | Affiliation | E-mail | | LI Danyang | Institute of Energy and Environmental Protection, Academy of Agricultural Planning and Engineering, Ministry of Agriculture and Rural Affairs, Beijing 100125, China
Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resource and Environmental Science, China Agricultural University, Beijing 100193, China
Key Laboratory of Plant and Breeding Combination, Ministry of Agriculture and Rural Affairs, Beijing 100125, China | | | WANG Juan | Institute of Energy and Environmental Protection, Academy of Agricultural Planning and Engineering, Ministry of Agriculture and Rural Affairs, Beijing 100125, China
Key Laboratory of Plant and Breeding Combination, Ministry of Agriculture and Rural Affairs, Beijing 100125, China | | | YUAN Jing | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resource and Environmental Science, China Agricultural University, Beijing 100193, China | | | QI Chuanren | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resource and Environmental Science, China Agricultural University, Beijing 100193, China | | | ZHANG Yanqing | Institute of Energy and Environmental Protection, Academy of Agricultural Planning and Engineering, Ministry of Agriculture and Rural Affairs, Beijing 100125, China
Key Laboratory of Plant and Breeding Combination, Ministry of Agriculture and Rural Affairs, Beijing 100125, China | | | DING Jingtao | Institute of Energy and Environmental Protection, Academy of Agricultural Planning and Engineering, Ministry of Agriculture and Rural Affairs, Beijing 100125, China
Key Laboratory of Plant and Breeding Combination, Ministry of Agriculture and Rural Affairs, Beijing 100125, China | | | WANG Huihui | Institute of Energy and Environmental Protection, Academy of Agricultural Planning and Engineering, Ministry of Agriculture and Rural Affairs, Beijing 100125, China
Key Laboratory of Plant and Breeding Combination, Ministry of Agriculture and Rural Affairs, Beijing 100125, China | | | SHEN Yujun | Institute of Energy and Environmental Protection, Academy of Agricultural Planning and Engineering, Ministry of Agriculture and Rural Affairs, Beijing 100125, China
Key Laboratory of Plant and Breeding Combination, Ministry of Agriculture and Rural Affairs, Beijing 100125, China | shenyj09b@163.com | | LI Guoxue | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resource and Environmental Science, China Agricultural University, Beijing 100193, China | ligx@cau.edu.cn |
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| Abstract: |
| To compare pollutant production and the discharge coefficient of sheep under different feeding methods, a large-scale sheep farm with half pasturing and half pen feeding in the pastoral areas of the Yunnan-Guizhou Plateau, and another sheep farm with full pen feeding in the hilly areas of the middle and lower reaches of the Yangtze River in China were selected as experimental sites. Pollutant production and the discharge coefficient of Guizhou semi-fine wool sheep and Hu sheep were measured at different feeding stages. The results showed that the pollutant production coefficient of manure, urine, chemical oxygen demand, total nitrogen, total phosphorus, ammonium nitrogen, nitrate nitrogen, copper, and zinc were 0.97 kg·d-1, 0.53 L·d-1, 318.01 g·d-1, 7.12 g·d-1, 2.03 g·d-1, 2.89 g·d-1, 41.00 mg·d-1, 0.76 mg·d-1, and 14.77 mg·d-1, respectively, for every Guizhou semi-fine wool sheep and 0.99 kg·d-1, 0.56 L·d-1, 384.76 g·d-1, 8.98 g·d-1, 1.56 g·d-1, 1.46 g·d-1, 41.34 mg·d-1, 0.38 mg·d-1, and 41.84 mg·d-1, respectively, for every Hu sheep. There were significant positive relationships between feces weight and feed weight and between urine volume and water volume. The pollutant discharge coefficient was affected by the pollutant production coefficient, and was related to feces weight, the concentration of pollutants in feces and urine, and the feeding method. The ratio of the pollutant discharge coefficient to the production coefficient was related to the sheep feeding method and the excrement cleaning method. This ratio was lower for sheep farms with full pen feeding than those with half pasturing and half pen feeding. Therefore, if the cost and breeding scale are not considered, to control the environmental pollution caused by the sheep breeding industry in China, the full pen feeding method is recommended. |
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