1. The Key Laboratory for Farm Animal Genetic Resources and Utilization of Ministry of Agriculture of China; Institute of Animal Sciences (IAS); Chinese Academy of Agricultural Sciences (CAAS); No 2 Yuanmingyuan West Rd. Haidian Beijing 100193 China
2. Xinjiang Academy of Animal Science; Urumqi Xinjiang 83000 China
3. United States Department of Agriculture; Agricultural Research Service; Avian Disease and Oncology Laboratory; East Lansing MI 48823 USA
4. Department of Animal Genetics and Breeding; College of Animal Science and Technology; China Agricultural University; Beijing 100094 China