To optimize the co-culture system ofgranulosa cell monolayers(GCM) the effects of cultural time in vitro, the different species and the replaced time of GCM on in vitro development of cattle parthenogenetic embryos were observed. 为优化颗粒细胞单层共培养体系,实验研究了颗粒细胞单层体外培养时间、颗粒...