Abstract
The present study was conducted to investigate the influence of aging of recipient oocyte on the developmental ability of reconstituted mouse embryos produced from the cytoplast of oocytes and single blastomeres of early or late 2-cell stage embryos by electrofusion. Oocytes were obtained at 14 (newly ovulated oocytes), 18, 22 (oocyte that time passed after ovulation; aged oocyte) hr after hCG injection and oocyte cytoplast was produced by manual enucleation using a fine glass needle under the dissecting microscope. The aging of the oocytes significantly influenced on the fusion rate of the reconstituted embryos (14 hr: 42.7-47.2% vs. 22 hr: 75.3-77.6%). Similarly, the cleavage rate of reconstituted embryos increased with aging of the oocytes (14 hr: 50.8-56.3% vs. 22 hr: 82.2-90.7%). The percentage of reconstituted embryos produced from cytoplast of aged oocytes (22 hr post hCG) and single blastomeres of late 2-cell stage embryos developing to the blastocyst (20.8%) was significantly higher than that of reconstituted embryos produced by other combinations (2.0-8.2%: P < 0.01). Although cell cycle stage of donor nuclei influenced to developmental ability of reconstituted embryos, these results are probably related to the aging of the oocytes since aged oocytes can be activated more easily by electrical stimulation than newly ovulated oocytes.
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