Related Experiment Videos
Sex differences in the play fighting activity of golden hamster infants
R F Guerra1, M L Vieira, E Takase
1Universidade Federal de Santa Catarina, Departamento de Psicologia, Florianópolis, Brasil.
Insights
Golden hamster play fighting behavior differs between same-sex and opposite-sex partners. Environmental cues, like partner sex, appear to influence play fighting more than internal factors.
Area of Science:
- Ethology
- Animal Behavior
- Comparative Psychology
Background:
- Play fighting is a common behavior in juvenile mammals.
- Understanding the factors modulating play fighting is crucial for comprehending social development.
Purpose of the Study:
- To investigate the influence of partner sex on play fighting behavior in golden hamsters.
- To compare play fighting dynamics in male-male, female-female, and female-male dyads.
Main Methods:
- Observed and recorded play fighting behaviors in golden hamsters from day 25 to 31.
- Analyzed dyadic interactions, focusing on physical contact time and play fighting duration.
- Assessed dominance through pinning posture alternation and active/passive roles.
Main Results:
- Heterosexual dyads (female-male) showed reduced play fighting with increased physical contact.
- No significant sex dominance was observed in heterosexual dyads.
- Male-male and female-female dyads exhibited similar play fighting patterns, with few significant differences.
Conclusions:
- Partner's sex, an environmental stimulus, appears to be a primary modulator of play fighting in golden hamsters.
- Endogenous factors, such as androgen levels, may play a lesser role in modulating this behavior.
Abstract:
Play fighting of homosexual and heterosexual dyads in golden hamsters was studied. The behaviors of male-male (MM), female-female (FF), and female-male (FM) dyads were recorded from the 25th to the 31st day of age. Play fighting activity of heterosexual dyads was depressed since MF and FM dyads exhibited a significantly high physical contact time and engaged in less play fighting, with a significantly lower time spent on such activity. Alternation ratio in the pinning posture was very high and subjects did not differ in the mean number of active (top) and passive pinning (under) in each dyad, showing an inexistence of sex dominance. In most cases, differences in the performances of MM and FF dyads were not significant. We have concluded that play fighting in golden hamsters may be predominantly modulated by environmental stimuli (sex of the partner) rather than by endogenous stimuli (androgen level).