1. Percentage of undergoing germinal vesical breakdown and PB1 extrusion in cumulus-oocyte complex groups was higher than that in denuded oocyte groups(P
卵丘-卵母细胞复合物各组的卵母细胞生殖泡破裂发生率和第一极体排除率明显高于裸卵各组（P
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2. Percentage of undergoing germinal vesical breakdown and PB1 extrusion in cumulus-oocyte complex groups was higher than that in denuded oocyte groups(P
