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- W1996564651 abstract "The present work was designed to study the in vitro and in vivo viability, as assessed by blastocyst formation, pregnancy rate and term delivery of bovine embryos produced under completely defined conditions with or without insulin-like growth factor I (IGF-I) following direct transfer after cryopreservation. Slaughterhouse-derived bovine oocytes were matured for 24h, fertilized with frozen-thawed spermatozoa and cultured in vitro under completely defined conditions with or without exposure to IGF-I (5 ng/ml). Only those embryos classified as excellent or good quality blastocysts were frozen. Each blastocyst was individually loaded into a straw, seeded and pre-cooled to -7 degrees C. After 10 min at -7 degrees C straws were frozen further to -30 degrees C at a rate of 0.3 degrees C/min and then plunged into liquid nitrogen. Synchronized recipient cows received one embryo in the horn ipsilateral to the corpus luteum (CL). Pregnancies were diagnosed by ultrasonography 35-45 days after embryo transfer (ET). IGF-I failed to improve cleavage rate, as well as blastocyst production, when added during in vitro culture (IVC). Pregnancy outcome was not significantly improved in cows that received an IGF-I-treated embryo compared with controls (4/10 versus 3/10, respectively). Five out of six calves delivered to date were born alive and healthy. We have shown that it is possible to obtain healthy live offspring from frozen-thawed embryos produced under chemically defined conditions after direct transfer." @default.
- W1996564651 created "2016-06-24" @default.
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- W1996564651 date "2002-02-01" @default.
- W1996564651 modified "2023-09-26" @default.
- W1996564651 title "Offspring resulting from direct transfer of cryopreserved bovine embryos produced in vitro in chemically defined media" @default.
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- W1996564651 doi "https://doi.org/10.1016/s0378-4320(01)00178-6" @default.
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