In order to improve the clevage rate and the blastocysst rate, we have studied several elements including stage of ?rnsexual development, follicles and Luteal factors that influnce in vitro maturation and in vitro fertilization of bovine oocytes. The rnresults are described as follows: There was no difference in the cleavage rate(74.7% and 81.5%)and the blastocyst rate (23.0 and 26.8%) between ovarien oocytes ?rnfrom pubertal heifers and from matured cows, but all of them were significantly higher than those of oocytes from prepubetal heifers (P?rn＜0.05). The development competence after in maturation of oocytes from ovaries with Corpus Luteal was inferior to that of oocytes from ?rnovaries without Corput Luteal (the cleavage rate was 58.0% and 79.9%, the blastocyst rate was 13.4% and 27.1%, P＜0.05). There was no ?rndifference between the oocytes from ovaries with dominent follicle and from ovaries without dominent follicles.%利用屠宰母牛卵巢，对来自不同性机能发育阶段母牛的卵巢卵母细胞，不同状态卵巢卵泡的卵母细胞的体外成熟（IVM）、体外受精（IVF?rn）进行了系列研究。结果表明，来自初情期、性成熟母牛卵巢的卵母细胞受精后的卵裂率（74.7%和81.5%）、囊胚率（23.0%和26.8%）显著高于来自初情期前?rn母牛卵巢卵母细胞的卵裂率（18.8%）和囊胚率（1.8%），P＜0.05；有黄体卵巢的卵母细胞体外受精后的发育能力显著低于无黄体卵巢卵母细胞?rn（卵裂率58.0%∶79.9%，囊胚率13.%∶27.1%， P＜0.05）；优势卵泡的有无对卵母细胞的卵裂率和囊胚率无明显影响
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