Increasing litter size in a sheep breed by marker-assisted selection of BMPR1B A746G mutation

1College of Animal Science and Technology, China Agricultural University, Beijing 100193, People’s Republic of China 2Institute of Animal Science and Veterinary of Hebei Province, Baoding 071000, People’s Republic of China 3College of Animal Science and Technology, Agricultural University of Hebei, Baoding 071000, People’s Republic of China 4Hebei Liansheng Agricultural Development Company Limited, Baoding 072750, People’s Republic of China