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;