Factors influencing oocyte and embryo quality in cattle
نویسندگان
چکیده
منابع مشابه
Factors influencing oocyte and embryo quality in cattle.
Following in vitro maturation, approximately 90% of immature bovine oocytes will reach metaphase II and extrude the first polar body; approximately 80% will undergo fertilization and cleave, at least once, to the two-cell stage. However, only about 30-40% will ever reach the blastocyst stage. This would suggest that the post-fertilization part of the process of in vitro embryo production, the l...
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Background: The biochemical characteristics of the follicular fluid (FF) play essential role in oocyte quality, the subsequent fertilization potential and embryo development. The oocyte quality and metabolism largely depends on follicular microenvironment. Present study aimed to investigate the relationship between oocyte quality and FF homocysteine (Hcy) level in women undergoing to IVF treatm...
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In the normal human menstrual cycle, the final phase of ovarian folliculogenesis leading upto the pre-ovulatory stage is gonadotropin dependent. Luteinising hormone (LH) acts synergistically with follicle stimulating hormone (FSH) to achieve follicular steroidogenesis, luteinisation and ovulation. It therefore follows that the maturational process of the oocyte contained within the follicle and...
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Background: Abnormal oocyte morphology has been associated with the hormonal environment to which the gametes are exposed. 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 metaphase II were ...
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Compared to other mammalian species, pig oocytes and embryos are characterized by high lipid contents stored mainly as lipid droplets in the cytoplasm. This fact has a negative influence on manipulations on oocytes and embryos and, in general, biotechnological procedures are much less advanced in pigs than in cows. This paper discusses current methods for modifying porcine oocytes and embryos u...
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ژورنال
عنوان ژورنال: Reproduction Nutrition Development
سال: 2001
ISSN: 0926-5287,1297-9708
DOI: 10.1051/rnd:2001142