1. Key Laboratory of Animal Genetic, Breeding and Reproduction in Shaanxi Province College of Animal Science and Technology Northwest Agriculture & Forestry University Shaanxi China
2. College of Animal Science and Animal Medicine Tianjin Agricultural University Tianjin China
3. Centre de recherche en reproduction et fertilité Faculté de médecine vétérinaire Université de Montréal St‐Hyacinthe QC Canada