A decision model was constructed to compare genetic testing and not testing, for the transfer of all suitable embryos, one at a time, from a cycle with up to ten embryos, until a first live birth was achieved or there were no more embryos available (a full cycle). Two strategies were investigated: (i) a fresh transfer with subsequent serial warmed cryopreserved embryo replacement, and (ii) free...

BACKGROUND Assisted hatching (AH) in fresh embryo transfer (ET) could be associated with increased implantation rates. However, very few prospective randomized studies have specifically addressed the issue of AH during frozen-thawed embryo transfers (FET) cycles, those that have reported controversial results. The aim of this study was to evaluate the benefit of an enzymatic zona pellucida trea...

Continuous improvements to assisted reproductive technology (ART) have facilitated the advancement and preservation of animal genetics as well as animal reproductive efficiency. One of the ART techniques is cryopreservation which facilitates embryo transfer procedures. In the present experiment embryos produced in vivo or in vitro were transferred to the recipient ewes just after collection (fr...

Aim Human chorionic gonadotropin (hCG) is used frequently for luteal support in fresh in vitro fertilization cycles as it induces progesterone secretion from the ovaries after oocyte retrieval and modulates the endometrium for implantation in fresh cycles. In contrast, hCG is not usually used for the transfer of cryopreserved-thawed embryos in estrogen/progesterone replacement cycles because ov...

BACKGROUND The aim of this study was to analyse the outcome of closed blastocyst vitrification of embryos biopsied at the cleavage stage. METHODS Vitrification of supernumerary blastocysts was performed using the closed CBS-VIT High Security straws. Warming cycles (n = 100) for patients with preimplantation genetic diagnosis (PGD) and/or aneuploidy screening in the fresh cycle were analysed. ...

BACKGROUND Despite of higher pregnancy rate after frozen embryo transfer (FET) which is accepted by the majority of researches, the safety of this method and its effect on neonatal outcome is still under debate. OBJECTIVE The aim of this study was to evaluate pregnancy and neonatal outcome of FET compare to fresh cycles. MATERIALS AND METHODS In this study,1134 patients using fresh ET and 2...

OBJECTIVE To characterize the incidence and risk factors for monochorionic diamniotic(MC-DA) twinning after assisted reproductive technologies (ART). DESIGN Retrospective population-based study. SETTING The study was conducted in China; Department of Reproductive Medicine Center at The First Affiliated Hospital of Anhui Medical University. POPULATION A cohort of 8860 clinical pregnancies ...

Embryo transfer is an important technology to improve and increase the high genetic value cattle in a short period in both daily and beef industries. This manuscript discussed current status of embryo transfer technologies in Japan and the world. The conception rates of embryo transfer both in fresh and frozen embryos were stable last two decades in Japan. Therefore, embryo transfer in Japan is...

AIMS To compare the outcome in in vitro fertilisation (IVF) children (after fresh embryo transfer) from multiple and singleton births with one another, and with normally conceived control children. METHODS A cohort of 278 children (150 singletons, 100 twins, 24 triplets and four quadruplets), conceived by IVF after three fresh embryos had been transferred, born between October 1984 and Decemb...

BACKGROUND In order to optimize IVF strategies, particularly with the use of single embryo transfer, good predictive models are required. Here, we develop a model to allow such prediction, and the structure of the models point to more general conclusions about the mode of action of prognostic factors. METHODS Anonymized data from consecutive embryo transfers in five IVF centres in the UK for ...