objective: the objective of this study was to investigate the pathological alterations of methionine for chicken embryo.in recent years, amino acids are used in veterinary medicine for many purposes. they injected into hatching eggs to increase chick body weight and performance at hatch, but the adverse effects of amino acids have always been a major concern. there is scant information availabl...

BACKGROUND The impact of controlled ovarian stimulation (COS) on oocyte and subsequent embryo quality remains controversial. In the present study we have compared embryo quality in natural and stimulated cycles in the same group of patients. METHODS This retrospective study was comprised of patients with a regular menstrual cycle who had IVF after COS using rFSH in a long GnRH agonist protoco...

The Society for Assisted Reproductive Technology (SART) method of embryo grading is unique, simple, and widely practiced, and its use has been mandatory for SART membership programs since 2010. Developed by SART in 2006, the current embryo grading system categories, “good, fair, and poor,” are limited because they do not describe the best 1-2 embryos in the interest of keeping pace with the shi...

diethylstilbestrol (des) was widely used in the past, as the morning after contraception, but its application became extremely limited due to several complications including delayed clear cell adenocarcinoma in female infants. however, the use of des increased during the past decade for hormone replacement therapy. the aim of this study was to investigate possible teratogenicity of this synthet...

Background: Successful implantation requires presence of a good quality embryo and receptive endometrium. Endometrial receptivity is ability endometrium to successfully attach embryo, nourish keep it alive. Sonographic findings are weighed according uterine scoring system for reproduction (USSR) or biophysical profile (UBP) by Applebaum. It has become absolute necessity evaluate uterus prior tr...

Human embryos are selected for transfer using morphology at the cleaving and blastocyst stages. Zygote morphology has been related to implantation and pregnancy. The aim of this study was to relate pronuclear morphology to blastocyst development. Zygotes were scored according to distribution and size of nucleoli within each nucleus. Zygotes displaying equality between the nuclei had 49.5% blast...