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- W2019403521 abstract "The objective of this study was to determine fertilization rates and developmental ability of porcine oocytes following injection of round spermatid and round spermatid nucleus with artificial activation either 2 h before or immediately after injection. Electrical stimulation at 2 h before spermatid injection significantly increased the incidence of normal fertilization compared with that following injection without stimulation or with stimulation immediately after injection. Incidences of formation of 2 pronuclei and of apposition were not different in oocytes following intracytoplasmic spermatid and spermatid nucleus injection. Chromosome analysis revealed that most oocytes were diploid either following round spermatid or round spermatid nucleus injection. There was no diploid set of chromatin in oocytes at 20 h following sham injection. At 6 d following injection blastocoele formation was seen in the oocytes following round spermatid (25%) and round spermatid nucleus injection (27%). However, none of the oocytes developed to the blastocyst stage 6 d following sham injection. The average cell numbers of blastocysts 8 d after injection of spermatid and spermatid nucleus were 99 and 87, respectively. These results suggest that electrical stimulation before injection enhances the incidence of fertilization following round spermatid injection in the pig. Our study also indicates that either the round spermatid or it's nucleus can be used to produce viable embryos by injection into unfertilized porcine oocytes." @default.
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- W2019403521 date "1999-06-01" @default.
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- W2019403521 title "Fertilization and in vitro development of porcine oocytes following intracytoplasmic injection of round spermatid or round spermatid nuclei" @default.
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- W2019403521 doi "https://doi.org/10.1016/s0093-691x(99)00088-6" @default.
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