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Murine aggression induced by a boar chemosignal: a stimulus presentation dependency
Physiology & Behavior
|January 1, 1986
Summary
The boar chemosignal steroid, 5 alpha-androst-16-ene-3-one, promotes aggression in male mice only when mixed with or near urine. This suggests urine is crucial for detecting this aggression-promoting chemical cue.
Area of Science:
- Animal Behavior
- Chemical Ecology
- Neuroethology
Background:
- The boar chemosignal, 5 alpha-androst-16-ene-3-one, is a steroid implicated in social and aggressive behaviors.
- Previous research has explored its role, but the precise conditions for its activity remain unclear.
Purpose of the Study:
- To investigate the aggression-promoting properties of 5 alpha-androst-16-ene-3-one.
- To determine the role of urine in the chemosignal activity of this steroid.
Main Methods:
- Male mice were exposed to the steroid mixed in water or urine, or juxtaposed with urine.
- Agonistic behavior was quantified to assess the steroid's effects.
Main Results:
- The steroid alone in water did not induce aggression.
- When mixed with or adjacent to male urine, the steroid significantly increased agonistic behavior.
- Proximity to urine was essential for the steroid's aggression-promoting effects.
Conclusions:
- Urine acts as a critical co-stimulus or orienting cue for the detection of 5 alpha-androst-16-ene-3-one.
- The combined presentation of the steroid and urine creates a distinct stimulus complex.
- Findings challenge the species specificity of boar chemosignals and highlight the importance of stimulus presentation in chemocommunication research.