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Competitive fighting in the rat
Journal of Comparative and Physiological Psychology
|January 1, 1975
Summary
Food deprivation triggers competitive fighting in laboratory rats. Fighting behavior, including offensive postures and attacks, occurred equally in males and females, with heavier rats initiating aggression.
Area of Science:
- Animal Behavior
- Neuroscience
- Ethology
Background:
- Aggression and fighting are complex behaviors influenced by various factors.
- Understanding the triggers and characteristics of competitive fighting is crucial in animal behavior studies.
- Food deprivation is a known stressor that can elicit aggressive responses in some species.
Purpose of the Study:
- To investigate the conditions under which competitive fighting can be reliably induced in laboratory rats.
- To characterize the specific behaviors associated with competitive fighting in this model.
- To examine factors influencing the frequency and initiation of fighting, such as kinship, sex, and prior experience.
Main Methods:
- Pairs of like-sexed laboratory rats (110-120 days old) were food-deprived for 48 hours.
- A single piece of food was placed in their food hopper to elicit competition.
- Animals were housed together since weaning, with comparisons made between littermate and non-littermate pairs.
Main Results:
- Competitive fighting was successfully induced, characterized by offensive sideways posture, full aggressive posture, bite, and kick attacks.
- Fighting was more frequent in non-littermate pairs compared to littermate pairs.
- Fighting occurred equally in male and female pairings. Prior food deprivation experience enhanced fighting probability, and heavier animals initiated attacks more often.
Conclusions:
- Food deprivation is an effective method for inducing competitive fighting in laboratory rats.
- Kinship influences fighting frequency, suggesting a role for social familiarity.
- Sex does not appear to influence fighting, while body weight and prior deprivation experience are significant factors in aggression.
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