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Related Experiment Videos

Control of ovarian function in cattle.

R Webb1, J G Gong, A S Law

  • 1AFRC, Institute of Animal Physiology and Genetics Research, Roslin, Midlothian, UK.

Journal of Reproduction and Fertility. Supplement
|January 1, 1992
PubMed
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Cattle ovarian function relies on complex feedback. A dominant follicle emerges per cycle, suppressing others, a mechanism distinct from inhibin and influenced by factors like bovine somatotropin (BST).

Area of Science:

  • Reproductive biology
  • Endocrinology
  • Veterinary science

Background:

  • Cattle ovarian function is regulated by intricate local and systemic feedback mechanisms.
  • Gonadotrophins and ovarian steroids/proteins orchestrate this control, ensuring single ovulation in over 96% of females per cycle.
  • Follicular development in cattle follows a wave-like pattern, typically with two to three waves per oestrous cycle.

Purpose of the Study:

  • To elucidate the mechanisms controlling follicular growth, dominance, and recruitment in cattle.
  • To investigate the role of gonadotrophins, steroids, proteins, and other factors in regulating ovarian function.
  • To understand the systemic 'dominance' exerted by a dominant follicle over subordinate follicles.

Main Methods:

  • Analysis of follicular wave patterns and dominant follicle emergence.

Related Experiment Videos

  • Investigating the effects of gonadotrophin-releasing hormone (GnRH) and human chorionic gonadotrophin (hCG) on ovulation.
  • Assessing the impact of recombinant bovine somatotropin (BST) on small antral follicle populations.

    • Main Results:

    • A dominant follicle emerges per wave, suppressing subordinate follicle growth systemically.
    • The dominance mechanism does not involve inhibin, and inhibin may not be primary in FSH control in cattle, unlike in sheep.
    • Recombinant bovine somatotropin (BST) treatment doubled small antral follicles without altering gonadotrophin levels, suggesting a different recruitment pathway.

    Conclusions:

    • The precise control of ovarian function in cattle involves complex dominance and recruitment mechanisms.
    • Understanding these mechanisms, including the factor responsible for dominance and BST-induced recruitment, is key to optimizing cattle reproductive efficiency.
    • Further research into these factors will enhance the precise control of ovarian function in cattle.