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- W2014711478 abstract "Three experiments were designed to evaluate the effects of vitrification using Cryotop method on MII porcine oocyte viability, chromosomes configuration, meiotic spindle morphology and in vitro fertilization; to do this, in vitro matured oocytes were subjected to the cryoprotectant treatment excluding the plunging into liquid nitrogen, the whole vitrification/warming/rehydration procedure or no treatment (control). In experiment 1 viable oocytes were not reduced by either cryoprotectants or vitrification when they were evaluated immediately after warming and cryoprotectant dilution. However, after a 2 h incubation, the survival rate significantly decreased (P < 0.05). In experiment 2 cryoprotectant exposure significantly (P < 0.05) influenced spindle morphology even if chromosome organization did not vary, while vitrification significantly (P < 0.05) increased oocytes with damaged spindles and chromosomes displaced from the metaphase plate. No significant improvements in these parameters were observed after 2 h of incubation but, on the contrary, the rate of oocytes with normal chromosome configuration was reduced. In experiment 3 significant differences among the three groups in the fertilization rate but not in the percentages of monospermy fertilization were recorded; in addition, exposure to cryoprotectants and vitrification significantly (P < 0.05) increased degenerated oocyte rate. Overall, these findings confirm that porcine oocytes at MII stage are very sensitive to vitrification, which reduces the rate of viable oocytes and alters microtubule organization, thus impairing fertilization; in addition, incubation of oocytes for 2 h after devitrification seems to be detrimental rather than ameliorative. Further improvements of the current protocol will be necessary in order to optimize the Cryotop method for vitrifying pig matured oocytes." @default.
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- W2014711478 date "2011-08-01" @default.
- W2014711478 modified "2023-10-14" @default.
- W2014711478 title "Pig oocyte vitrification by cryotop method: Effects on viability, spindle and chromosome configuration and in vitro fertilization" @default.
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- W2014711478 doi "https://doi.org/10.1016/j.anireprosci.2011.07.010" @default.
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