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Related Experiment Videos

Gonadal function in mink under artificial photoperiods

R G Gulevich1, D V Klotchkov, L N Ivanova

  • 1Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk.

Journal of Reproduction and Fertility
|January 1, 1995
PubMed
Summary

Artificial light exposure alters mink sex steroid levels and fertility. Early autumn light conditions increased testosterone in males and estradiol in females, enhancing fertility, while reduced daylight had minimal impact.

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Area of Science:

  • Reproductive Biology
  • Animal Endocrinology
  • Photoperiodism

Background:

  • Seasonal changes in photoperiod influence reproductive cycles in many species.
  • Artificial light can disrupt natural hormonal rhythms and reproductive success.

Purpose of the Study:

  • To investigate the effects of artificial light simulating early autumn conditions on sex steroid concentrations and fertility in juvenile minks.
  • To determine the impact of different photoperiods on reproductive hormone profiles and gonad responsiveness.

Main Methods:

  • Juvenile minks were exposed to two artificial light conditions (photoperiod I and II) mimicking early autumn.
  • Plasma sex steroid concentrations (testosterone, estradiol) were measured over time.
  • Fertility was assessed, and gonad response to human chorionic gonadotropin (hCG) injection was evaluated.

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Main Results:

  • Photoperiod I induced prolonged modifications in sex steroid concentrations, with decreased testosterone in males and increased estradiol in females before the mating period.
  • Females under photoperiod I showed increased fertility.
  • Photoperiod II had less impact on female sex steroid levels and did not alter fertility.
  • Gonadal response to hCG was higher in males and females exposed to artificial light compared to controls.

Conclusions:

  • Artificial light conditions mimicking early autumn can significantly alter sex steroid profiles and enhance reproductive parameters in minks.
  • Photoperiod manipulation offers a potential tool for managing mink reproduction.
  • The sensitivity of the reproductive system to photoperiodic changes varies between sexes and light conditions.