1. Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction, Education Ministry of China, Huazhong Agricultural University, Wuhan, Hubei, 430070, China
2. Animal Genomics and Improvement Laboratory, BARC, US Department of Agriculture, Agriculture Research Service, Beltsville, MD 20705, USA
3. The Cell Wall Utilization and Biology Laboratory, US Department of Agriculture, Agriculture Research Service, Madison, WI, 53706, USA