본 연구는 체외성숙 배지에 첨가하는 PVP의 농도, EGF, cysteine 및 PVP의 단독 또는 혼합첨가가 한우 체외수정란의 체외발생에 미치는 영향을 검토하였다. 체외성숙 배지에 PVP의 첨가농도$(0.1{sim}3.0%)$에 따른 분할율은 차이가 없었으나, 배반포 발달율은 0.5% PVP 첨가군이 가장 높았다(P<0.05). PVP, EGF 및 cysteine의 단독 및 혼합 첨가에 따른 분할율은 cysteine 단독첨가군이 높았으나(P<0.05), 배반포 발달율은 차이가 없었다. Inner cell mass 수는 대조군과 cysteine 첨가군이 PVP 첨가군에 비하여 유의하게 높았고(P<0.05), 총 세포수도 cysteine 첨가군에서 가장 높았다. 수정란이식 결과는 대조군, EGF, cysteine 및 EGF+cysteine 군의 임신율은 $46.1{sim}63.6%$로서 비슷하였으나, PVP 첨가군은 10%로서 다른 군에 비하여 유의하게 낮았다(P<0.05). 본 연구 결과는 체외성숙 배지에 PVP의 첨가로 배 발생은 가능하지만, 세포의 품질에는 악영향을 미치는 것을 보여준다.
This study was examined the effects of concentrations of polyvinylpyrrolidone(PVP) and supplementation of EGF, cysteine and PVP during in vitro maturation on the development of bovine embryos. In experiment 1, 0.1 to 3.0% PVP was supplemented to IVM medium before IVF. The development rates to the blastocyst stage was significantly higher in 0.5% PVP group than 3.0% PVP group (P<0.05). In experiment 2, EGF, rysteine and PVP were supplemented to IVM medium. The hight cleavage rate was obtained from cysteine group, but blastocyst formation rates did not differ among groups. The highest total cell number and inner cell mass (ICM) cell number were observed in cysteine group. In PVP group, ICM cell number was significantly low than those of cysteine and control groups (P<0.05). After embryo transfer, pregnancy rate was significantly low in PVP group compared to other groups (P<0.05). These results indicate that the supplementation of PVP in IVM medium support the embryo development, but has a deteriorate effect on the blastocyst quality.
