Abstract Study question Does embryo compaction positively correlate with blastocyst development and further embryonic ploidy status? Summary answer Fully compacted embryos develop into good-quality blastocysts, have shorter developmental times, are related to status. What is known already To succeed in assisted reproduction technique (ART), it necessary select that the highest potential. So, nu...

abstract background: research studies on reproductive mechanism of laboratory animals are essential for further advancement of assisted reproductive techniques (art). one of these studies includes the assessment of in-vitro development of pre-implantation embryos. the objective was to compare the cleavage rates and morphology of in-vivo formed 2 to 8 cell embryos and blastocysts with in-vitro c...

improvements on embryo micromanipulation techniques led to the use of embryo biopsy in commercial embryo transfer programs for genetic analysis of preimplantation bovine embryos. the aim of this study was to evaluate the quality of bovine blastocyst derived from embryos biopsied at different precompacted morulae stages by assessment of cryosurvivability of the resulting blastocysts. the in vitr...

The success rate of human in-vitro fertilization (IVF) remains low, with only approximately 10% of embryos transferred resulting in a term pregnancy. A major contributor to this embryonic loss is poor embryo development in vitro. Such poor development can be attributed to both chromosomal and anatomic anomalies in oocytes after ovarian stimulation and to suboptimal embryo culture conditions. Th...

Progression of fertilized mammalian oocytes through cleavage, blastocyst formation and implantation depends on successful implementation of the developmental program, which becomes established during oogenesis. The identification of ooplasmic factors, which are responsible for successful embryo development, is thus crucial in designing possible molecular therapies for infertility intervention. ...

Porcine embryos have become raw materials for different programmes of reproductive biotechnology and the in vitro production of embryos has some advantages over in vivo production in gene transfer programmes and for xenotransplantation. Despite this promising future, several problems limit the success of the in vitro production (IVP) of viable porcine embryos. Porcine IVP has not been fully dev...

Since first described in the mid-eighties somatic embryogenesis of spruce has been extensively utilized both as a tool for mass propagation and as a model system for the investigation of structural, physiological and molecular events occurring during embryo development in conifers. Despite the increased efforts to optimize media composition and culture environment, production of somatic embryos...

Background One of the important complications of assisted reproductive technologies is multiple pregnancy, the aim of the present study was to indentify the risk factors of multiple pregnancy independent of number of transfred embryos. MaterialsAndMethods This retrospective study reviewed the medical records of patients underwent intracytoplasmic sperm injection (ICSI) cycle in Royan Institute ...

CONTEXT To maximize birth rates, physicians who perform in vitro fertilization (IVF) often transfer multiple embryos, but this increases the multiple-birth risk. Live-birth and multiple-birth rates may vary by patient age and embryo quality. One marker for embryo quality is cryopreservation of extra embryos (if embryos are set aside for cryopreservation, higher quality embryos may have been ava...

Background: Morphology and presence of Polar body in the oocyte are denoting oocyte quality and is used as a criterion for prognosis of embryo quality. However, little is known about ICSI result of oocytes with two polar bodies. The present study reports the result of ICSI in a case having several oocytes with two polar bodies. Materials and Methods: A 34 years old patient (K.H.) with history o...