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- W2019280038 abstract "The present study was undertaken to investigate the effects of ethylene glycol concentration and time of exposure to equilibration solution on the post-thaw morphological appearance and the in vitro maturation rate of buffalo oocytes. Vitrification solution-I (VS-I) consisted of 4.5 M ethylene glycol (EG), 3.4 M dimethyl sulphoxide, 5.56 mM glucose, 0.33 mM sodium pyruvate and 0.4% w/v bovine serum albumin in Dulbecco’s phosphate buffered saline (DPBS), whereas vitrification solution-II (VS-II) contained 3.5 M EG, with other constituents at same concentrations as in VS-I. The equilibration solutions-I and II were prepared by 50% dilution (v/v) of VS-I and VS-II, respectively, in DPBS. Prior to vitrification, the cumulus-oocyte complexes (COCs) were exposed to equilibration solution-I or II for 1 or 3 min at room temperature (25–30°C). Groups of four to five oocytes were then placed in 15 μl of respective vitrification solution, and immediately loaded into 0.25 ml French straws, each containing 150 μl of 0.5 M sucrose in DPBS. The straws were placed in liquid nitrogen (LN2) vapour for 2 min, plunged and stored in LN2 for at least 7 days. The straws were thawed by keeping in warm water at 28°C for 20 s, and the oocytes were equilibrated for 5 min in 0.5 M sucrose for one-step dilution. The percentage of oocytes found to be morphologically normal varied from 89 to 96% for the two equilibration solutions and the two exposure times. Among the damaged oocytes, cracking of zona pellucida was the abnormality observed most frequently. The nuclear maturation rate of oocytes equilibrated in equilibration solutions-I and II for 1 (28 and 24%, respectively) or 3 min (32 and 33%, respectively) did not differ significantly. These results show that it is possible to cryopreserve buffalo oocytes by vitrification using a combination of 3.5 M EG and 3.4 M DMSO with an exposure time of 3 min." @default.
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- W2019280038 date "1991-01-01" @default.
- W2019280038 modified "2023-09-24" @default.
- W2019280038 title "Cryopreservation of bovine embryos by vitrification" @default.
- W2019280038 doi "https://doi.org/10.1016/0093-691x(91)90170-i" @default.
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