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• W2146170643 abstract "Two studies were conducted to evaluate the influence of cryoprotectant, cooling rate, container and cryopreservation procedure on the post-thaw viability of sheep embryos. In Study 1, late morula- to blastocyst-stage embryos were exposed to 1 of 10 cryoprotectant (1.5 M, glycerol vs propylene glycol)-plunge temperature treatments. Embryos were placed in glass ampules and cooled at 1°C/min to −5°C, seeded and further cooled at 0.3°C/min to −15, −20, −25, −30 and −35°C before rapid cooling by direct placement in liquid nitrogen (LN2). Post-thaw embryo viability was improved (P<0.01) when embryos were cooled to at least −30°C before LN2 plunging. Although there were no overt differences in embryo viability between cryoprotectant treatments (each resulted in live offspring after embryo transfer), there was a lower (P<0.01) incidence of zona pellucida damage using propylene glycol (4%) compared to glycerol (40%). In Study 2, embryos were equilibrated in 1.5 M propylene glycol or glycerol or a vitrification solution (VS3a). Embryos treated in propylene glycol or glycerol were divided into ampule or one-step® straw treatments, cooled to −6°C at 1°C/min, seeded, cooled at 0.5°C/min to −35°C, held for 15 minutes and then transferred to LN2. Embryos vitrified in the highly concentrated VS3a (6.5 M glycerol + 6% bovine serum albumin) were transferred from room air to LN2 vapor, and then stored in LN2. Propylene glycol- and glycerol-treated embryos in straws experienced lower (P<0.05) degeneration rates (27%) and yielded more (P<0.05) hatched blastocysts (73 and 60%, respectively) at 48 hours of culture and more (P<0.05) trophoblastic outgrowths (67 and 53%, respectively) after 1 week than vitrified embryos (47, 40 and 20%, respectively). In vitro development rate for VS3a-treated embryos was similar (P>0.10) to that of ampule controls, which had fewer (P<0.05) expanded blastocysts compared to similar straw treatments. Live offspring were produced from embryos cryopreserved by each straw treatment (propylene glycol, 3 of 7; glycerol, 1 of 7; VS3a, 2 of 7). In summary, freeze-preservation of sheep embryos was more effective in one-step straws than glass ampules and propylene glycol tended to be the optimum cryoprotectant. Furthermore, these findings demonstrate, for the first time, the biological competence of sheep embryos cryopreserved using the simple and rapid procedure of vitrification." @default.
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• W2146170643 date "1991-08-01" @default.
• W2146170643 modified "2023-10-15" @default.
• W2146170643 title "Analysis of cryoprotectant, cooling rate and in situ dilution using conventional freezing or vitrification for cryopreserving sheep embryos" @default.
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• W2146170643 doi "https://doi.org/10.1016/0093-691x(91)90386-r" @default.
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