Pornwiroon, SurachaiKunathikom, SomboonMakemaharn, OrawanHuanaraj, Rattanaphorn2009-05-272009-05-272006-12-12Pornwiroon S, Kunathikom S, Makemaharn O, Huanaraj R. Vitrification of mouse oocyte using open pulled straws compared with needles. Journal of the Medical Association of Thailand. 2006 Dec; 89(12): 2015-20http://imsear.searo.who.int/handle/123456789/40522Chotmaihet Thangphaet.OBJECTIVE: To compare the survival rate of mouse oocytes and fertilization rate between using open pulled straws (OPS) and needles for vitrification. MATERIAL AND METHOD: Meiosis II oocytes from female C57B/6J mice aged 7-8 weeks were collected and allocated to two groups for vitrification by using OPS or needles. Vitrified oocytes were thawed, morphological survival and fertilization rate were examined. RESULTS: There was no obvious difference between the morphological survival rates of vitrified mouse oocytes using OPS and needles (66.7% vs 64.8%). Proportions Difference 1.9% (95% CI -7.1, 10.7). The vitrified oocytes from the needle had significantly higher percentages of fertilization rate than OPS (76.8% vs 62.5%). Proportions Difference -14.3% (95% CI -24.5, -3.6). CONCLUSION: Vitrification method of mouse oocytes using needles when compared to OPS provides a similar morphological survival rate and higher fertilization rate.engAnimalsCryopreservation --instrumentationFemaleMeiosisMiceMice, Inbred C57BLNeedlesOocytes --ultrastructureComparative Study