1. Key Laboratory of Animal Genetics, Breeding and Reproduction, MARA, National Engineering Laboratory for Animal Breeding, Beijing Engineering Technology Research Center of Raw Milk Quality and Safety Control, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
2. College of Life Sciences and Bioengineering, Beijing Jiaotong University, Beijing 100044, China
3. Department of Animal Sciences, Purdue University, West Lafayette, Indiana 47907, United States
4. Beijing Sunlon Livestock Development Co. Ltd, Beijing 100176, China
5. USDA-ARS Livestock Behavior Research Unit, West Lafayette, Indiana 47907, United States