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- W2588331316 abstract "We evaluated the meiotic and developmental competence of GV-stage equine oocytes vitrified under different conditions. In a preliminary study, using dimethyl sulfoxide (D), ethylene glycol (EG) and sucrose (S) as cryoprotectants, the maturation rate was higher for cumulus-oocyte complexes (COCs) held overnight before vitrification (37%) than for those vitrified immediately (14%; P < 0.05). Thereafter, all COCs were held overnight before vitrification. In Experiment 1 we compared 1 min (1m) and 4 min (4m) exposure to vitrification and warming solutions; oocytes that subsequently matured were fertilized by ICSI. The maturation rate was similar between timing groups (29–36%), but was significantly lower than that for controls (73%). The 1m treatment yielded one blastocyst (11%), vs. 19% in controls. In Experiment 2, propylene glycol (PG) and trehalose (T) were also used. We compared two base solutions: M199 with 10% FBS (M199+), and 100% FBS; three cryoprotectant combinations: D-EG-S; PG-EG-S; and PG-EG-T; and two timings in vitrification solution: ∼30 s (30s) and 1 min (1m). The most effective treatment (FBS/PG-EG-T/30s) yielded 42% maturation, 80% cleavage and 1 blastocyst (10%), vs. 49%, 93% and 29%, respectively for controls (P > 0.1). In Experiment 3, we evaluated the toxicity of the M199/D-EG-S/1m and FBS/PG-EG-T/30s treatments, without actual vitrification. These treatments did not affect maturation but both significantly reduced blastocyst development (0% and 0%, vs. 21% for controls). This represents the second report of blastocyst development after vitrification of GV-stage equine oocytes, and presents the highest developmental competence yet achieved; however, more work is needed to increase the efficiency of this system." @default.
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- W2588331316 date "2017-04-01" @default.
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- W2588331316 title "Blastocyst development after intracytoplasmic sperm injection of equine oocytes vitrified at the germinal-vesicle stage" @default.
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- W2588331316 doi "https://doi.org/10.1016/j.cryobiol.2017.02.004" @default.
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