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Related Experiment Videos

Anovulation in non-reproductive female Damaraland mole-rats (Cryptomys damarensis).

A J Molteno1, N C Bennett

  • 1Department of Zoology and Entomology, University of Pretoria, Pretoria, South Africa.

Journal of Reproduction and Fertility
|June 24, 2000
PubMed
Summary

Social cues, not lack of mating, cause infertility in female Damaraland mole-rats. Inhibited hypothalamo-pituitary-gonadal axis maintains social hierarchy and reproductive skew in these rodents.

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Area of Science:

  • Reproductive biology
  • Animal behavior
  • Neuroendocrinology

Background:

  • Social structure in Damaraland mole-rats (Cryptomys damarensis) involves reproductive skew, with non-reproductive females experiencing anovulation.
  • The cause of anovulation (inhibitory social cues vs. lack of copulatory stimulation) and the role of gonadal steroids remain unclear.

Purpose of the Study:

  • To investigate the mechanisms of anovulation in non-reproductive female Damaraland mole-rats.
  • To determine if social cues or lack of mating primarily causes infertility.
  • To examine the contribution of gonadal steroid negative feedback to neuroendocrine differences.

Main Methods:

  • Assessed pituitary sensitivity and ovarian structure in reproductive, non-reproductive, and removed non-reproductive female mole-rats.

Related Experiment Videos

  • Administered Gonadotropin-Releasing Hormone (GnRH) challenge to measure Luteinizing Hormone (LH) secretion.
  • Measured circulating progesterone concentrations and examined ovarian corpora lutea post-hystero-ovariectomy.

    • Main Results:

    • Removed non-reproductive females showed higher LH secretion than colony non-reproductive females, but lower than reproductive females.
    • Ovulation (presence of corpora lutea) occurred spontaneously in removed non-reproductive and reproductive females.
    • Differential inhibition of gonadotropin secretion occurred independently of gonadal steroids, with reproductive females showing greater GnRH-stimulated LH secretion even after hystero-ovariectomy.

    Conclusions:

    • Female Damaraland mole-rats are spontaneous ovulators.
    • Anovulation is caused by inhibitory social cues within the colony, not a lack of copulatory stimulation.
    • Inhibition of the hypothalamo-pituitary-gonadal axis plays a role in maintaining reproductive skew.