1. 1Animal Science and Technology College, Beijing University of Agriculture, Beijing, China
2. 2Zhangjiagang Agriculture and Rural Affairs Bureau, Jiangsu, China
3. 3Department of Animal Husbandry and Veterinary, Beijing Vocational College of Agriculture, Beijing, China
4. 4National Grazing Headquarter, Beijing, China
5. 5Beijing Tianyuanaorui Bio-technology Limited, Beijing, China
6. 6Guangdong Polytechnic of Science and Trade, Guangdong, China