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- W2046354470 abstract "Factors affecting sensitivity of preimplantation embryos and follicular oocytes to cryopreservation were analyzed in the equine and bovine species. (1) Survival of equine blastocysts after two-step freezing in the presence of glycerol as the cryoprotective agent (CPA) was influenced by development of the embryonic capsule. The use of ethylene glycol (EG) with sucrose as CPAs improved the post-thaw survival of blastocysts and made it possible to transfer the embryos into recipient mares without removing the CPAs. In addition, early blastocysts cryopreserved by vitrification could develop both in vitro and in vivo when the embryos were exposed to vitrification solution in a stepwise manner. The vitrification procedure was also applied to the relatively large expanded blastocysts. (2) Bovine embryos produced in vitro have been considered to be highly sensitive to the process of cryopreservation. To solve this problem, Day-7 blastocysts produced in a serum-free system were cooled at 0.3 C/min rather than 0.6 C/min before being plunged into liquid nitrogen, resulting in no loss of the post-thaw viability. The supplementation of LAA in IVM/IVF media or IVC medium was effective in producing pronuclear-stage zygotes or morula-stage embryos relatively tolerable to freezing, respectively. (3) Transmission electron microscopic observation of immature equine oocytes showed that cellular injury occurred near the sites of gap-junctions between cumulus cells and the oocyte. In cattle, higher fertilization rates of oocytes were obtained when the oocytes were subjected to cryopreservation at an intermediate stage during IVM (GVBD for freezing, Met-I for vitrification). Vitrification of bovine Met-II oocytes in open-pulled glass capillaries, characterized by an ultra-rapid cooling rate (3,000-5,000 C/min), was found to avoid any harmful influence of vitrification and warming." @default.
- W2046354470 created "2016-06-24" @default.
- W2046354470 creator A5012180883 @default.
- W2046354470 date "2003-01-01" @default.
- W2046354470 modified "2023-10-13" @default.
- W2046354470 title "Cryopreservation of Follicular Oocytes and Preimplantation Embryos in Cattle and Horses." @default.
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- W2046354470 doi "https://doi.org/10.1262/jrd.49.13" @default.
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