Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province,College of Animal Science and Technology,Sichuan Agricultural University,Chengdu 611130,China;
Department of Veterinary Anatomy and Histology,Shaheed Benazir Bhutto University of Veterinary and Animal Sciences,Sakrand,Sindh 67210,Pakistan;
State Key Laboratory of AgroBiotechnology,China Agricultural University,Beijing 100193,China;
National Engineering Laboratory for Animal Breeding,Key Laboratory of Animal Genetics and Breeding of the Ministry of Agriculture,Beijing Key Laboratory for Animal Genetic Improvement,College of Animal Science and Technology,China Agricultural University,Beijing 100193,China;
Cell cycle; Cleavage rate; Melatonin; MetaphaseⅡoocyte; Parthenogenetic activation; Vitrification;