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Related Experiment Videos

Endocrine correlates of partner preference behavior in rams

J A Resko1, A Perkins, C E Roselli

  • 1Department of Physiology and Pharmacology, School of Medicine, Oregon Health Sciences University, Portland 97201-3098, USA.

Biology of Reproduction
|July 1, 1996
PubMed
Summary

Male-oriented rams show reduced testosterone production and lower brain aromatase activity, particularly in the preoptic area (POA). These endocrine differences may influence sexual orientation in rams.

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Area of Science:

  • Neuroendocrinology
  • Animal Behavior
  • Reproductive Biology

Background:

  • Sexual behavior in rams is influenced by complex endocrine and neural mechanisms.
  • A subset of rams exhibits male-oriented sexual behavior, preferring mating with males over females.
  • Understanding the neuroendocrine basis of sexual orientation in animals can provide insights into conserved biological pathways.

Purpose of the Study:

  • To compare endocrine profiles, specifically steroid concentrations, testicular biosynthesis capacity, and brain aromatase activity (AA), between male-oriented and female-oriented rams.
  • To investigate the role of testosterone (T) production and estrogen formation in the preoptic area (POA) in relation to sexual orientation.
  • To explore potential correlations between endocrine function and observed sexual behavior in rams.

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Main Methods:

  • Behavioral testing to classify rams as male-oriented or female-oriented based on mating preferences.
  • Radioimmunoassay (RIA) to measure serum concentrations of testosterone (T), dihydrotestosterone (DHT), androstenedione, estrone (E1), and estradiol-17 beta (E2).
  • In vitro biosynthesis assays using 3H-progesterone to assess testicular capacity for producing T and 17 alpha-hydroxyprogesterone.
  • Quantification of brain aromatase activity (AA) using a 3H2O assay in various brain regions, with a focus on the POA.

Main Results:

  • Male-oriented rams had significantly lower serum concentrations of T, E1, and E2 compared to female-oriented rams.
  • Testicular biosynthesis of T and 17 alpha-hydroxyprogesterone was significantly reduced in male-oriented rams.
  • Aromatase activity (AA) was significantly higher in the POA of female-oriented rams compared to male-oriented rams.
  • No significant differences were observed in DHT and androstenedione serum concentrations or AA in other brain regions.

Conclusions:

  • The testes of male-oriented rams exhibit a reduced capacity for testosterone production.
  • Higher aromatase activity in the POA of female-oriented rams suggests a role for estrogen in mediating sexual behavior.
  • These findings support the hypothesis that the capacity for aromatization influences sexual orientation in rams, potentially through neural pathways in the POA.