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- W1912175655 abstract "The protocol of in vitro production (IVP) of bovine embryos is one of the critical factors determining embryo viability after cryopreservation. In this study were used two differents protocols to produce IVP bovine embryos, with variations in protein source, oocyte/zygote density per media volume, with the aim to determine the in vitro and in vivo embryo survival after vitrification using hand-pulled glass micropipettes. Expanded blastocysts (D7) were morphologically selected by size ( ? 180 ?m) and osmotic behavior before they were randomly allocated to sub-groups by protocol: non-vitrified embryos (control; C) and vitrified embryos (V). For the evaluation of the in vitro survival, control embryos and a group of warmed vitrified embryos were in vitro -cultured (IVC) for 72 h. Re-expansion rates of warmed embryos at 24 h of IVC were 94.8% and 93.2% for Protocols 1 and 2, respectively. Hatching rates at 72 h of IVC of embryos from Protocol 1 (C=80% and V=75.8%) tended to be higher (P=0.0561, Chi 2 test) than those from Protocol 2 (C=67.2% and V=59.3%). For the evaluation of in vivo survival, 21 vitrified embryos per protocol were singly non-surgically transferred to synchronized recipients (n=42) after the in-straw cryoprotectant dilution, resulting in 4 (19%) pregnancies per group on Day 60 of gestation. In conclusion, despite a lower variation on in vitro embryo development between both IVP protocols, the use of different protocols under the same laboratory conditions did not afect the in vitro and in vivo embryo viability after vitrification into hand-pulled glass micropipettes." @default.
- W1912175655 created "2016-06-24" @default.
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- W1912175655 date "2018-06-27" @default.
- W1912175655 modified "2023-09-23" @default.
- W1912175655 title "Bovine in vitro embryo production protocol: does it really influence embryo cryotolerance?" @default.
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- W1912175655 doi "https://doi.org/10.22456/1679-9216.15069" @default.
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