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In-vivo and in-vitro maturation rate of oocytes from two strains of mice

Z. Polaski

Summary. Female mice of the KE and CBA strains were used to examine the rate of oocyte maturation in vivo and in vitro. In CBA females killed just before ovulation most preovulatory oocytes were already in the metaphase II stage, while the oocytes of KE mice were arrested at metaphase I until the time of ovulation, and further stages of maturation occurred in the oviduct, reaching the metaphase II stage 3–5 h later. A similar strain difference in oocyte maturation rate was observed from in-vitro culture of cumulus-free oocytes, isolated from the ovaries of PMSG-primed females and intact females killed at the metoestrous phase of the cycle. This indicates that the strain-specific course of maturation is determined in the oocyte by a few days before ovulation. Therefore, if the rate of oocyte maturation is influenced by somatic components of the follicle, this must occur at some earlier stages of follicle development.

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