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Effectiveness of the GnRH agonist Deslorelin as a tool to decrease levels of circulating testosterone in zebra
Karagh Murphy1, David A Wilson1, Mark Burton1
1Program in Neuroscience, Department of Zoology and Physiology, University of Wyoming, Laramie, WY, United States.
General and Comparative Endocrinology
|September 23, 2015
Summary
Deslorelin, a GnRH agonist, effectively and reversibly suppresses testosterone in songbirds. This new method offers a less invasive way to study hormone effects on vocal communication and neurobiology.
Area of Science:
- Neurobiology
- Endocrinology
- Animal Behavior
Background:
- Songbirds are crucial models for studying vocal communication neurobiology.
- Testosterone significantly influences neuronal development and activity in songbird brains.
- Current methods to alter testosterone (implants, castration) have limitations.
Purpose of the Study:
- To assess the efficacy of the GnRH agonist Deslorelin in modulating testosterone levels in songbirds.
- To evaluate Deslorelin as a less invasive alternative to existing methods for testosterone manipulation.
Main Methods:
- Adult male zebra finches received Deslorelin implants (5mg/kg).
- Song behavior, body mass, and blood testosterone levels were monitored pre- and post-treatment.
- Brain, testes, and heart morphology were assessed.
Main Results:
- Deslorelin (5mg/kg) significantly reduced testosterone levels.
- Observed song changes were similar to those in castrated birds.
- Testosterone suppression was reversible upon implant removal.
Conclusions:
- Deslorelin provides a novel, transient, and reversible method for suppressing testosterone in songbirds.
- This tool avoids the invasiveness and side effects associated with surgical castration.
- Facilitates research into the role of testosterone in songbird neurobiology and behavior.
