the aim of this study was to analyze the incidence of stage of embryonic development, embryo quality and the time of transfer on pregnancy rate in embryo transfer program timed. we were worked a total of 23holsteincowsasembryo donors, super-ovulated with gonadotropin of pregnant mare serum (pmsg) (2500 3000ui).69 cows were used as recipients of holstein dairy heifers with an age of20 months and...

BACKGROUND GnRH agonist and antagonist were developed to control the premature release of LH surge. There is some difference between two protocols. OBJECTIVE We compared the outcome of frozen-thawed embryo transfer in infertile women who used GnRH agonist or antagonist protocol for previous COH cycle and evaluation of any adverse effect of GnRH antagonist on oocyte and embryo. MATERIALS AND...

BACKGROUND Gonadotropin-releasing hormone (GnRH) agonist triggering plus 1,500 IU human chorionic gonadotropin (hCG) supplementation protocol was previously claimed effective in reducing the ovarian hyperstimulation syndrome (OHSS) incidence in high responders. METHODS This retrospective study included women with polycystic ovarian (PCO) morphology who were at high risk of OHSS and were given...

Aim Several studies have indicated that the cause of the increased birthweight of frozen-thawed embryos was associated with assisted reproductive technology (ART) procedures, such as cryopreservation. In the present study, the mean birthweight of singletons was compared between the ovulatory and hormone replacement therapy (HRT) cycles in order to investigate the primary factor that leads to hi...

Although the mechanisms under which sex ratio is controlled in nature remain unknown, researchers have attempted to treat sperm in an effort to predetermine the sex of the offspring. The methods of sperm separation that have been repeatedly reported to isolate fractions rich in X- or Y-chromosome bearing sperm are serum albumin gradient swim-up and flow cytometry. However, the ability of the se...