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• W2065258288 abstract "In the present study three factors were investigated that may affect the process of the first polar body extrusion in pig oocytes matured in vitro: IVM medium, oocyte diameter and donor genotype at the ryanodine receptor (RYR1) locus. In the first experiment, COCs were collected by the aspiration of slaughterhouse ovaries. Oocytes were matured in vitro at 39 °C, in humidified 5% CO2 atmosphere for 44 h using the following media: (1) TCM199 + hCG + eCG + follicular fluid (FF), (2) TCM199 + hCG + 17β-estradiol and (3) NCSU23 + hCG + eCG + FF. According to cytogenetic analysis, 98.1% of cells reached the second metaphase stage (MII). No significant differences were observed among IVM groups in terms of diploidy level. In the second experiment, oocytes collected by the aspiration or slicing of individual ovaries were matured in vitro in groups reflecting their origin. One ovary was considered a donor. IVM was carried out under conditions described in experiment I, with the use of TCM199 + hCG + 17β-estradiol. A total of 68 ovaries/donors were included in this study. Granulosa cells collected from each ovary were used as DNA source in molecular (RFLP) analysis. Genotype frequencies at the RYR1 locus were as follows: CC, 0.46; CT, 0.48 and TT, 0.06. After maturation the diameter of each denuded oocyte was determined with the use of a computer aided system. Five size categories were distinguished: <90, 90–100, 100.1–110, 110.1–120 and >120 μm. The average diameter of haploid oocytes at MII stage was 111.7 μm, whereas that of diploid cells was 110.4 μm. According to statistical analysis, diploidy was not related to the oocyte diameter. That trait, however, was influenced by the donor genotype at the RYR1 locus. The TT genotype was associated with a higher rate of diploidy." @default.
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• W2065258288 date "2005-07-01" @default.
• W2065258288 modified "2023-09-24" @default.
• W2065258288 title "IVM media, oocyte diameter and donor genotype at RYR1 locus in relation to the incidence of porcine diploid oocytes after maturation in vitro" @default.
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• W2065258288 doi "https://doi.org/10.1016/j.theriogenology.2004.11.019" @default.
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