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Related Concept Videos

Oogenesis02:07

Oogenesis

In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...
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Oogenesis

Oogenesis,  the process of developing egg cells (female gametes), occurs within the ovaries and is fundamental to female fertility. This sequence begins during fetal development when diploid oogonia in the developing ovaries undergo mitotic divisions to produce primary oocytes. By birth, these primary oocytes enter prophase I of meiosis but become arrested in this stage, remaining suspended until puberty.
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Related Experiment Video

Updated: May 18, 2026

Vitrification of In Vitro Matured Oocytes Collected from Adult and Prepubertal Ovaries in Sheep
06:53

Vitrification of In Vitro Matured Oocytes Collected from Adult and Prepubertal Ovaries in Sheep

Published on: July 10, 2021

Glucogenic supply increases oocyte developmental competence in sheep.

F Berlinguer1, A Gonzalez-Bulnes, I Contreras-Solis

  • 1Department of Animal Biology, University of Sassari, Via Vienna 2, 07100 Sassari, Italy. berling@uniss.it

Reproduction, Fertility, and Development
|October 10, 2012
PubMed
Summary

Glucogenic treatment in ewes improved oocyte quality and developmental competence. This nutritional strategy enhanced follicle development and increased fertilization and blastocyst rates in vitro.

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Last Updated: May 18, 2026

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In Vitro Culture Strategy for Oocytes from Early Antral Follicle in Cattle
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In Vitro Culture Strategy for Oocytes from Early Antral Follicle in Cattle

Published on: July 8, 2020

Area of Science:

  • Reproductive biology
  • Animal science
  • Endocrinology

Background:

  • Oocyte developmental competence is crucial for successful embryo production.
  • Nutritional strategies can influence reproductive outcomes in livestock.
  • Understanding glucose metabolism's role in follicular dynamics is important.

Purpose of the Study:

  • To investigate the impact of glucogenic supply on oocyte developmental competence in Sarda ewes.
  • To evaluate the effects of oral glucogenic treatment on follicular and corpus luteum function.
  • To assess the influence on in vitro embryo production rates.

Main Methods:

  • Synchronization of oestrous cycles using intravaginal progestagen sponges.
  • Oral administration of a glucogenic mixture or water to treated and control ewes, respectively.
  • Follicular development stimulation with FSH and assessment of glucose metabolism, follicle, and corpus luteum dynamics.
  • In vitro embryo production (IVP) from collected ovaries.

Main Results:

  • Glucogenic treatment significantly increased plasma glucose, progesterone, and oestradiol levels.
  • An increased number of 2-3 mm follicles was observed in treated ewes.
  • Higher fertilization and blastocyst rates were achieved from oocytes of glucogenic-treated ewes.

Conclusions:

  • Oral glucogenic supply positively influences follicle and corpus luteum functionality in ewes.
  • Glucogenic treatment enhances oocyte quality, leading to improved in vitro developmental kinetics and blastocyst output.
  • This nutritional approach shows potential for improving assisted reproductive technologies in sheep.