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Evidence for aggression-modulating pheromones in prepuberal pigs.

J J McGlone, S E Curtis, E M Banks

    Behavioral and Neural Biology
    |January 1, 1987
    PubMed
    Summary
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    Urine and plasma from aggressive pigs reduce aggression in other pigs. Handling may increase urine

    Area of Science:

    • Animal Behavior
    • Animal Science
    • Behavioral Biology

    Background:

    • Aggression in domestic pigs is influenced by various social and physiological factors.
    • Urine and other bodily fluids are known to contain chemical signals that can modulate social behavior.

    Purpose of the Study:

    • To investigate the aggression-influencing properties of urine and plasma in domestic pigs.
    • To determine if the aggressive state or handling of donor pigs affects the properties of their urine.

    Main Methods:

    • Behavioral bioassays using prepuberal castrated male and female domestic pigs.
    • Pigs were painted with test fluids and observed via videotape for 90 minutes.
    • Comparison of aggression levels when exposed to fluids from aggressive vs. socially stable pigs.

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    Main Results:

    • Urine and plasma from aggressive pigs significantly reduced the duration of aggressive behavior in test pigs.
    • The reproductive pheromone 5 alpha-androst-16-en-3-one also reduced attack duration.
    • Handling of donor pigs appeared to increase the aggression-promoting properties of urine.

    Conclusions:

    • Urine and blood plasma from aggressive pigs possess properties that inhibit aggression in other pigs.
    • Handling may alter the chemical composition or perception of urine, influencing its effect on aggression.
    • Aggression itself may inhibit the aggression-promoting properties of urine.