1. China Agricultural University, Beijing, China
2. Beijing Changping District Nankou Town Agricultural Clothing Center, Beijing, China
3. Beijing Changping District Shisanling Town Agricultural Clothing Center, Beijing, China
4. Beijing Changping District Animal Disease Prevention and Control Center, Beijing, China
5. Beijing Sunlon Livestock Development Co. Ltd., Beijing, China
6. Shijiazhuang Tianquan Elite Dairy Co. Ltd., Shijiazhuang, China