Results 221 to 230 of about 86,786 (260)

Frozen Storage and Transfer of Bovine Embryos

Journal of Animal Science, 1978
SUMMARY Viability of bovine embryos after freezing and thawing was studied to determine the optimal stage of development for freezing and requirements for synchrony of recipient and embryo for successful transfer. There was no significant difference in viability of frozen-thawed blastocysts obtained on day 7 and 8 after estrus providing they were ...
A O, Trounson, B F, Shea, G W, Ollis, M E, Jacobson   +3 more
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Transfer of frozen-thawed embryos in sheep

Veterinary Record, 1987
Embryos collected from ewes six days after oestrus were frozen in straws using ethylene-glycol as a cryoprotectant. The efficiency of the simplified freezing and thawing procedure was assessed after transfer, which resulted in an overall survival rate of 58.3 per cent.
Y, Heyman, C, Vincent, V, Garnier, Y, Cognie   +3 more
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Cervical transfer of deep frozen cattle embryos

Theriogenology, 1981
Cattle blastocysts were collected from 29 donors 7-8 days after estrus and frozen and stored in liquid nitrogen up to several months. Two procedures were used for freezing and thawing: -- procedure A: slow cooling to -60 degrees C (0.3 degrees C/min to -60 degrees C) and slow thawing (12 degrees C/min); -- procedure B: slow cooling to -30 degrees C (0 ...
J P, Renard, J P, Ozil, Y, Heyman
openaire   +2 more sources

Hormone replacement versus natural frozen embryo transfer for euploid embryos

Archives of Gynecology and Obstetrics, 2019
The goal of this study is to investigate hormone replacement (HR) versus natural frozen embryo transfer outcomes for euploid embryos.This is a retrospective cohort study at an academic medical center of patients undergoing in vitro fertilization with 24-chromosome day 5/6 preimplantation genetic testing for aneuploidies (PGT-A), from 2014 to 2018 using
Ange Wang, Gayathree Murugappan, Jonathan Kort, Lynn Westphal   +3 more
openaire   +2 more sources

Pregnancies after transfer of ultrarapidly frozen human embryos

Journal of Assisted Reproduction and Genetics, 1996
We report our experience of freezing human embryos using an ultrarapid freezing method.The patients were superovulated. Oocytes were inseminated and cultured in HTF + 10% serum. A maximum of three embryos was transferred and the rest of the embryos were frozen ultrarapidly after a 3-min equilibration period in PB1 + 3.5 M DMSO + 0.25 M sucrose. Embryos
A C, Lai, B P, Lin, C C, Chang, H D, Tsai, V W, Hwang, H Y, Lo   +5 more
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A simplified method of timing frozen embryo transfers

American Journal of Obstetrics and Gynecology, 1995
Our purpose was to compare a simple artificial hormone replacement regimen with two other protocols incorporating pituitary down-regulation with gonadotropin-releasing hormone agonist for frozen embryo transfers.We performed a retrospective analysis of pregnancy outcomes after 366 frozen embryo transfers timed by one of three hormone replacement ...
B, Yee, Y P, Lin, R R, Chacon, S, Soubra, G F, Rosen, D L, Cassidenti   +5 more
openaire   +2 more sources

Progesterone supplementation in the frozen embryo transfer cycle

Current Opinion in Obstetrics & Gynecology, 2015
Currently, different modalities with regard to endometrial preparation for frozen-thawed embryo transfer (FTET) are used, the natural and artificial cycles being the most common approaches. This review is aimed to update the current knowledge about progesterone supplementation in both types of protocols.Natural cycle-frozen-thawed embryo transfer (NC ...
Israel, Ortega, Juan Antonio, García Velasco   +1 more
openaire   +2 more sources

Frozen embryo transfer: the present practice and beyond

jbcpp, 2013
Abstract Background: With the success of oocyte donation in vitro fertilization (IVF) in postmenopausal women, the importance of endometrial preparation became obvious. This appears also very crucial for achieving pregnancy after frozen embryo transfer (FET) after failed fresh IVF cycles and FET in subsequent natural ...
Anjana Ray, Chaudhuri, Siddhartha, Chatterjee   +1 more
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Non-surgical transfer of deep-frozen bovine embryos

Theriogenology, 1978
Abstract Preservation of cattle embryos by methods of deep-freezing has recently been established (1, 11, 12) and provides a valuable addition to the possibilities of controlled breeding by embryo transfer in cattle. Already long distance transport of frozen embryos has been demonstrated (2, 6) and adopted by some commercial interests.
A O, Trounson, A, Brand, M H, Aarts
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Fresh Versus Frozen Embryo Transfer

2019
The fresh embryo transfer has traditionally performed in vitro fertilization (IVF) since 1978. The first pregnancy following the transfer of a frozen-thawed human embryo was reported in 1983. Since then, the clinical value of embryo cryopreservation has steadily increased over the decades. Improvements in vitrification now make frozen embryo transfer a
openaire   +1 more source