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- W1978687637 abstract "To determine the effect of maturational age of porcine oocytes on the induction of activation and development following nuclear transfer, we investigated maturation rate and efficacy of oocyte activation treatment with an electrical stimulus (ES) and cycloheximide (CHX) at various timing of maturation culture. Most oocytes developed to the metaphase II (MII) stage after 32 hr of maturation culture. Both in newly matured (32 and 36 hr of age) and MII-arrested (42 and 48 hr of age) oocytes, ES followed by exposure to CHX for 6 hr caused higher rates of pronuclear formation than ES alone. Effect of maturational age of oocytes on the development of parthenotes activated with ES and CHX was then examined. The highest percentage of parthenotes developed to blastocysts was obtained when ES was added at 42 hr of culture. Finally, newly matured (33 hr of age) and MII-arrested oocytes (44 hr of age) were enucleated, fused with serum-starved pig fetal fibroblasts and activated with ES and CHX around suitable timing (39 to 40 hr of age) or later (50 to 51 hr of age), respectively. The frequencies of cleavage (58.8%) and blastocyst formation (13.6%) of newly matured oocytes were significantly (P<0.05) higher than those of MII-arrested oocytes (38.9 and 1.8%, respectively). These results demonstrated that the development of porcine nuclear transfer embryos can be improved by using complete matured oocytes as cytoplasts and activation treatment with ES followed by CHX treatment." @default.
- W1978687637 created "2016-06-24" @default.
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- W1978687637 date "2001-01-01" @default.
- W1978687637 modified "2023-09-29" @default.
- W1978687637 title "Effects of Maturational Age of Porcine Oocytes on the Induction of Activation and Development In Vitro Following Somatic Cell Nuclear Transfer." @default.
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- W1978687637 doi "https://doi.org/10.1292/jvms.63.1003" @default.
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