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Physical separation and reduction of contact duration with sexually hyperactive bucks decrease testosterone

N López-Magaña1, L M Tejada2, D López-Magaña2

  • 1Centro de Investigación en Reproducción Caprina (CIRCA), Universidad Autónoma Agraria Antonio Narro, 27274 Torreón, Coahuila, Mexico; Centro de Investigación Biomédica, Universidad Autónoma de Coahuila, 27000 Torreón, Coahuila, Mexico.

Animal : an International Journal of Animal Bioscience
|May 31, 2024
PubMed
Summary

Physical separation and reduced contact with sexually hyperactive bucks decrease testosterone levels and sexual behavior in hypoactive bucks. This study investigated the "buck-to-buck effect" on testosterone secretion and sexual activity.

Keywords:
LibidoMale goatsPhotoperiodic treatmentsReproductive seasonalitySociosexual interactions

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Area of Science:

  • Animal behavior
  • Reproductive endocrinology
  • Mammalian physiology

Background:

  • The "buck-to-buck effect" describes how sexually hyperactive bucks stimulate testosterone secretion and sexual behavior in hypoactive bucks during seasonal sexual rest.
  • Understanding factors influencing this effect is crucial for managing reproductive cycles in livestock.

Purpose of the Study:

  • To determine if physical separation or reduced contact duration with sexually hyperactive bucks alters testosterone concentrations and sexual behavior in sexually hypoactive bucks.
  • To investigate the impact of modified social proximity on the "buck-to-buck effect".

Main Methods:

  • Experiment 1: Sexually hypoactive bucks were either separated by a fence or in permanent contact with sexually hyperactive bucks for 60 days under natural photoperiod.
  • Experiment 2: The duration of contact between sexually hypoactive and hyperactive bucks was varied (31 days vs. 10 days).
  • Hormonal (testosterone) and behavioral (nudging) parameters were measured in all groups.

Main Results:

  • In Experiment 1, bucks in constant contact with hyperactive bucks showed significantly higher testosterone levels and nudging behavior compared to separated bucks.
  • In Experiment 2, bucks with longer contact duration (31 days) exhibited higher testosterone levels and nudging behavior than those with shorter contact (10 days) after an initial period.
  • Both experiments demonstrated a significant effect of time and an interaction between time and group on the measured parameters.

Conclusions:

  • Physical separation and reduced contact duration with sexually hyperactive bucks significantly decrease testosterone concentrations and sexual behavior in hypoactive bucks.
  • The "buck-to-buck effect" is modulated by the degree and duration of social interaction between bucks.
  • These findings have implications for understanding social influences on reproductive physiology in male mammals.