Table 4.
Timing of meiotic events in ovulated GV oocytes (Group III) matured in vitro or in vivo
| Incubation period (h) | GV |
MI |
MII |
|||
|---|---|---|---|---|---|---|
| IVM | IVOM | IVM | IVOM | IVM | IVOM | |
| 1.5 | 5.9 (118) | 13.7 (95) | 94.1a (118) | 86.3a (95) | 0.0 (118) | 0.0 (95) |
| 10 | 0.0 (126) | 0.0 (160) | 1.6b (126) | 5.0b (160) | 98.4 (126) | 95.0 (160) |
The meiotic stages of oocytes in Group III mice at ovulation were 91.6% GV, 8.4% MI, and 0% MII (n = 120 oocytes). Data are presented as percent (total number of oocytes). Values with different superscripts are significantly different (P < 0.0001) within each oocyte maturation stage of germinal vesicle (GV), metaphase I (MI), or metaphase II (MII). Groups of mice of 8–10 were used for each experiment.
IVM: in vitro maturation; IVOM: in vivo oocyte maturation.