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This study was carried out to investigate the effects of the glycerol equilibration methods and embryo grades before freezing on the survival rate after thawing in mouse embryos. The results obtained from this study were as follows: 1. The number of embryos of grade I(Excellent), II(Good) and III(Fair) before freezing in this study was 97(27.4%), 160(45.2%) and 97(27.4%), respectively. 2. The average survival rate of frozen-thawed embryos in 3 and 5 steps glycerol equilibration was 66.7% and 64.1%, and the rate of transfererable embryos after culture was 68.9% and 69.0%, respectively. 3. Out of embryo grade I and II before freezing, the transferable rate after thawing was 75.2% and 48.1%, respectively, and grade I embryos before freezing was higher transferable rate than that of grade II.
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