1. Key Laboratory of Animal Genetics; Breeding and Reproduction of the Ministry of Agriculture; National Engineering Laboratory for Animal Breeding; College of Animal Science and Technology; China Agricultural University; Beijing China
2. National Institute of Biological Sciences; NIBS; Beijing China
3. Health Science Center; Hebei University; Baoding Hebei China
4. Department of Animal Reproduction; Faculty of Animal Science and Technology; Agricultural University of Hebei; Baoding Hebei China
5. College of Life Science; Jilin Agricultural University; Changchun Jilin China