1. Shandong Key Lab of Animal Disease Control and Breeding, Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, Shandong, China
2. Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, College Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, China
3. College of Life Sciences, Shandong Normal University, Jinan, Shandong, China