Background: Vitrification and warming of blastocysts is an established procedure for the preservation of embryos during IVF. Vitrification is so successful that it allows for elective single embryo transfer (eSET) to be performed routinely, since the frozen embryos will be available with high implantation potential if the fresh embryo fails. Comprehensive chromosome screening (CCS) is also a pr...

Morphogenetic cell interactions during development were studied by combining cell ablation and cell lineage tracing techniques in embryos of the leech Helobdella triserialis. Ablation of an identified ectodermal teloblast, or teloblast precursor blastomere, on one side of an early embryo was often found to result in the later abnormal migration of the progeny cells of the corresponding contrala...

Luteinizing hormone (LH), progesterone and estradiol profiles in peripheral blood serum were compared among parous and nonparous females with normal, abnormal or no e~ryonic development. Ho~nal profiles between parous and nonparous females of the same e~ryonic status did not differ and the data were combined. Estrous cycle length was longer (Pe.05) in parous (22.3k.4 days) than nonparous female...

Abstract For decades we have looked for marker of embryo competence. And while come a long way in terms identifying markers related to embryonic competence, lot research is still focused on finding this simple measurable indicator predicting positive outcome the individual treatment. Many potential indicators been evaluated. This includes cumulus oocyte complex, zona pellucida, perivitelline sp...

background: abnormal oocyte morphology has been associated with the hormonal environment to which the gametes are exposed. objective: in this study, we evaluated the oocytes morphology, fertilization rate, embryos quality, and implantation rate resulted of retrieved oocytes in different times after human chorionic gonadotrophin (hcg) administration. materials and methods: a total of 985 metapha...

The in vitro-produced embryo could play a central role in dairy and beef production systems because of its potential role in genetic selection strategies and crossbreeding schemes, and because it can be integrated into reproductive management strategies for improving pregnancy rates in herds with low fertility. The promise attendant upon use of in vitro-produced embryos is not being fully reali...

The Drosophila embryo proceeds through thirteen mitotic divisions as a syncytium. Its nuclei distribute in the embryo's interior during the first six divisions, dividing synchronously with a cycle time of less than ten minutes. After seven divisions (nuclear cycle 8), the syncytial blastoderm forms as the nuclei approach the embryo surface and slow their cycle time; subsequent divisions proceed...

Many higher eukaryotes have evolved strategies for the maternal control of growth and development of their offspring. In higher plants this is achieved in part by postmeiotic gene activity controlling the development of the haploid female gametophyte. stunter1 (stt1) is a novel, recessive, maternal effect mutant in maize that displays viable, miniature kernels. Maternal inheritance of stt1 resu...

Mouse embryo culture has been established and applied in the study of the causal mechanisms of abnormal development. Mouse embryo culture can be used as an experimental system to examine the influence of teratogen on early development, together with investigations using developmental engineering such as chimera, transgenic mice and nuclear transfer. We combined mouse embryo culture with embryo ...

Embryo quality during the in vitro developmental period is of great clinical importance. Experimental genetic studies during this period have demonstrated the association between specific gene expression profiles and the production of healthy blastocysts. Although the quality of the oocyte may play a major role in embryo development, it has been well established that the post - fertilization pe...