The ultimate challenge for all in vitro fertilisation (IVF) clinics is to develop the ability to select for transfer the best single embryo first, from the patient’s cohort of embryos, thereby maximising the chance of pregnancy while the incidence of multiple pregnancies is kept to a minimum and fewer transfer cycles are required. This ambition has driven extensive research and development into...

OBJECTIVE This study aims to evaluate the effectiveness of GnRH agonist in comparison with hCG for triggering final oocyte maturation in endometrial preparation of letrozole stimulation protocols for frozen-thawed embryo transfer. METHODS The frozen-thawed embryo transfer cycles (FET) that use the letrozole stimulation protocols for endometrial preparation were divided into two groups accordi...

background:   objective: the aim of our study was to assess the effect of storage duration of frozen embryo on art outcome.   materials and methods: in this retrospective study the data of 651 frozen-thawed embryo transfer cycles were assessed over a 36-months period. our patients were categorized according to storage time of freeze. group i: less than 90 days, group ii: between 90-365 days. gr...

ABSTRACT Global advances in reproductive biotechnology have allowed for the transfer of embryos from donor females with high genetic merit to recipients using cryopreservation technique, which preserves an embryo excellent quality and viability, thereby achieving a feasible pregnancy rate. The objective this study was evaluate viability Holstein that been cryopreserved more than 40 years under ...

objective:  to investigate the reproductive outcome of artificial endometrial preparation with exogenous steroids for frozen-thawed embryo transfer with and without pre-treatment with depot gonadotropin releasing hormone agonist (gnrh-a) in women with regular menses. amaterials and methods: this is a prospective randomized clinical trial conducted in two rt centers on 176 women undergoing froze...

The effects of vitrification on the embryo viability of the Persian sturgeon (Acipenser persicus) were investigated in this study. Vitrificant solutions (VS1-VS6) were prepared by combining propylene glycol (PG) as basic cryoprotectant plus other permeable and non-permeable cryoprotectants in different concentration. Embryos at neurulation stage were selected and incubated in six vitrificant so...

The assisted reproductive technologies (ARTs) as tailored to the production of rhesus monkeys at the Oregon National Primate Research Center (ONPRC) are described. Efficient fertilization of mature oocytes recovered by aspiration from females subjected to follicular stimulation was achieved with fresh or frozen sperm by intracytoplasmic sperm injection (ICSI). Embryo development to the early cl...

The aim of this comparative clinical study was to examine whether the fertilizing potential of frozen-thawed testicular sperm in the most severe cases of hypospermatogenesis is reduced compared with fresh testicular sperm. The results could determine the necessity of using fresh testicular sperm cells, which mandates involving the spouse by performing simultaneous in vitro fertilization intracy...