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- 第一极体：在卵子的减数分裂过程中，第一次分裂产生的细胞，其细胞质较多，染色体数目与母细胞相同，但细胞体积较小，不具有生殖能力。
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农业科学 第一极体 The experiment results showed that expansive ratcs of cumulus cells were 80.65, 86.00, 85.40 and 85.71％ respectively in 4 groups, there were no significantly diflbrents between groups（p<0.05）; releasing rates of first polar body（PbI） were 16.47, 7.41, 12.28 and 19.23％ respectively, the second group was significantly lower than the others （p<0.05）. 第一极体放出率分别为16.47％、7.14％、12.89％和19.23％。 第二组低于其他各组,但差异不显著（P>0.05）。
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Conclusion Zygotes and embryo quality can be predicted by morphology of the first polar body. 结论通过卵细胞第一极体形态可预测受精卵及卵裂期胚胎质量。 - 2
The results indicated that nutria oocytes, like other rodent oocytes, can be matured in vitro, complete first meiotic division and discharge first polar body. 结果表明海狸鼠卵母细胞与其它啮齿动物的卵母细胞一样，能够在体外培养成熟，完成第一次减数分裂，排出第一极体。 - 3
Objective To investigate the relationship between the first polar body morphology of oocyte and the zygote morphology in pronucleus stage, embryo quality in cleavage stage. 目的探讨卵细胞第一极体形态与原核期受精卵形态、卵裂期胚胎质量的关系。
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