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The final oocyte maturation up to metaphase II after LH stimulation of the ovulatory follicle is the culmination of the previous processes and equips the oocyte with a haploid chromosomal compartment and the cell biological apparatus specialized for fertilization and initial embryonic development. Expand
Oocyte ultrastructure in bovine primordial to early tertiary follicles
The growth of the bovine oocyte is associated with the relocation and modulation of a number of cytoplasmic organelles as well as the development of oocyte specific structures such as the zona pellucida and cortical granules. Expand
Bovine oocyte diameter in relation to maturational competence and transcriptional activity
The aims of the present series of experiments were to establish a possible relationship between bovine oocyte diameter and follicle size, investigate the developmental ability of oocytes of differentExpand
Effect of increasing progesterone concentration from Day 3 of pregnancy on subsequent embryo survival and development in beef heifers.
In conclusion, insertion of a PRID on Day 3 of the oestrous cycle increased serum progesterone concentrations on subsequent days, which, while having no phenotypic effect on embryonic development on Days 5 or 7, was associated with an increase in embryonic size on Days 13 and 16. Expand
Developmental, qualitative, and ultrastructural differences between ovine and bovine embryos produced in vivo or in vitro
The quality of ovine blastocysts was significantly higher than their bovine counterparts produced under identical in vitro conditions suggesting inherent species differences between these two groups affecting embryo quality. Expand
Follicular oocyte growth and acquisition of developmental competence.
  • T. Fair
  • Biology, Medicine
  • Animal reproduction science
  • 15 October 2003
The present review describes some of the findings to date and investigates the complexity of the orchestration of the events that control oocyte growth and ultimate acquisition of developmental competence under continuous investigation. Expand
Oocyte and embryo quality: effect of origin, culture conditions and gene expression patterns.
Evidence for an effect of oocyte origin and/or in vitro maturation conditions on the developmental capacity and gene expression patterns in the oocyte is demonstrated and the well-documented effects of post-fertilization culture environment on embryo gene expression and quality are highlighted. Expand
Progesterone and conceptus elongation in cattle: a direct effect on the embryo or an indirect effect via the endometrium?
Data provide clear evidence to support the hypothesis that P(4)-induced changes in the uterine environment are responsible for the advancement in conceptus elongation reported previously in cattle and that, interestingly, the embryo does not need to be present during the period of high P( 4) in order to exhibit advanced elongation. Expand
Progesterone-Regulated Changes in Endometrial Gene Expression Contribute to Advanced Conceptus Development in Cattle1
Validation of a number of genes by quantitative real-time PCR indicated that P4 supplementation advances endometrial gene expression by altering the time (FABP, DGAT2, and MSTN) or duration (CRYGS) of expression pattern for genes that contribute to the composition of histotroph. Expand
Culture of in vitro produced bovine zygotes in vitro vs in vivo: implications for early embryo development and quality.
It is demonstrated that while bovine zygotes cultured in vitro are capable of rates of development similar to those of their in vivo cultured counterparts, there are significant differences in embryo cryosurvival. Expand