Abstract
Release of oocytes of LT/Sv mice from the meiosis-inhibiting influence of antral follicles promotes parthenogenetic activation and development to early cleavage stages of 14% of the eggs. However, to attain the potential to develop to blastocysts under the culture conditions used, the oocytes must mature within follicles for 8–9 hr after human chorionic gonadotropin (HCG) administration. The results suggest that some positive influence, which does not occur during spontaneous oocyte maturation under defined conditions in vitro, occurs within preovulatory follicles and imparts developmental competence to the maturing oocytes.
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