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Competitive fighting in the rat.

J M Zook, D B Adams

    Journal of Comparative and Physiological Psychology
    |January 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    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.

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    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.

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  • 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.