Review Article
Cryopreservation of Mammalian Oocyte for Conservation of Animal Genetics
Table 2
Comparison of oocyte and embryo cryopreservation methods.
| Freezing procedures |
| Conventional slow-freezing method | Vitrification |
| (1) Standard 0.25 ml straws | (1) Several devices for loading embryos and oocytes (conventional straws, open pulled straw, cryoloop, cryoleaf, cryotop, etc.) |
| (2) Low cryoprotectant concentration | (2) High cryoprotectant concentration/ reduced volume and time with vitrification solution |
| (3) Seeding at 5 to C, controlled slow cooling (0.1 to C/min) | (3) Ultra-rapid cooling rates (C/min or C/min using OPS and cryoloop) |
| (4) Plunging at 30 to C and storage in liquid nitrogen (C) | (4) Plunging into liquid nitrogen (C) |
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Adapted from Pereira and Marques, 2008 [3].
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