Endocrine correlates of musth in free-ranging Asian elephants (Elephas maximus) determined by non-invasive faecal steroid hormone metabolite measurements

PLoS One. 2013 Dec 17;8(12):e84787. doi: 10.1371/journal.pone.0084787. eCollection 2013.

Abstract

The occurrence of musth, a period of elevated levels of androgens and heightened sexual activity, has been well documented for the male Asian elephant (Elephas maximus). However, the relationship between androgen-dependent musth and adrenocortical function in this species is unclear. The current study is the first assessment of testicular and adrenocortical function in free-ranging male Asian elephants by measuring levels of testosterone (androgen) and cortisol (glucocorticoid--a physiological indicator of stress) metabolites in faeces. During musth, males expectedly showed significant elevation in faecal testosterone metabolite levels. Interestingly, glucocorticoid metabolite concentrations remained unchanged between musth and non-musth periods. This observation is contrary to that observed with wild and captive African elephant bulls and captive Asian bull elephants. Our results show that musth may not necessarily represent a stressful condition in free-ranging male Asian elephants.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Elephants / physiology*
  • Gonadal Steroid Hormones / metabolism*
  • India
  • Male
  • Sexual Behavior, Animal*

Substances

  • Gonadal Steroid Hormones

Grants and funding

The Rufford Small Grants Foundation, London, U.K. Grant # 8350-1. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.