polyspermy

Relation between polyspermy and oocyte number , fertilization rate , insemination sperm concentration and time

多精受精与卵细胞数、受精率、授精密度及时间关系的探讨

Conclusion Short-time exposure of sperm can be taken as a supplement for reduction polyspermy .

结论短时受精可作为降低多精受精的一种补充办法。

These mean that there are relationship between polyspermy and oocyte number , fertilization rate but not between insemination sperm concentration and time .

提示多精受精与卵细胞数、受精率有关，与授精密度及时间无关。

Polyspermy occurred more frequently during in vitro fertilization than in vivo in pig , although it has been reported commonly in both cases .

受精过程无论体内或体外，都容易发生多精入卵，体外受精则更甚。

The major cytological mechanisms of polyploid formation are union of unreduced gametes , somatic doubling and polyspermy .

多倍体主要是通过未减数配子融合，体细胞染色体加倍以及多精受精三种方式起源的。

Now and then , there exists the phenomenon that a few sperms penetrate into egg , while polyspermy is few .

有多精入卵现象，极少数卵子多精受精。

These results suggest that the shape and the size of the micropylar apparatus is favourable for the sperm to penetrate the egg envelop and to block polyspermy .

研究表明，精孔器的大小与形态有利于精子快速入卵，是精子穿过卵膜的唯一通道。

Results showed that in polyspermy group oocyte number were 15.54 ± 7.16 , fertilization rate 0.81 ± 0.13 , insemination sperm concentration 404,000 ± 51,200 progressively motile sperm / oocyte .

结果显示，多精受精组卵细胞数15.54±7.16枚，受精率0.81±0.13，授精密度40.40±5.12万精子/卵细胞；

A large vesicle is formed at the joint region of the spermatozoid and the egg . The vesicle can prevent other sperms enter the egg , and avoid polyspermy .

精子进入卵细胞后，在精卵的结合处会产生大的囊泡，它具有阻止其他精子进入卵细胞的作用，从而避免多精受精。

In oocytes matured in vitro for 48h , polyspermy ratio is 73 % , and lower than that in 36h ( 83 % ) and 24h ( 80 % ) .

结果显示，体外成熟48h的卵母细胞其多精受精率为73%，比体外成熟36h（83%）、24h（80%）的卵母细胞要低。