Effect of Open Pulled Straw Cryopreservation on Developmental Competence of Thawed Bovine Oocytes Following Maturation, Fertilization and Culture in vitro是什么意思 Effect of Open Pulled Straw Cryopreservation on Developmental Competence of Thawed Bovine Oocytes Following Maturation, Fertilization and Culture in vitro怎么读