Behavior Genetics

, Volume 26, Issue 5, pp 477–488

Selective breeding for isolation-induced intermale aggression in mice: Associated responses and environmental influences

  • N. Kenneth Sandnabba

DOI: 10.1007/BF02359752

Cite this article as:
Kenneth Sandnabba, N. Behav Genet (1996) 26: 477. doi:10.1007/BF02359752


Aggressive (TA) and nonaggressive (TNA) lines of mice were established by selective breeding for isolation-induced intermale aggression. This paper summarizes and updates studies performed on the TA and TNA lines. The genetic analysis revealed that in these lines the genes for aggression are located on the autosomes and demonstrate a Mendelian segregation. The genes are expressed only in the presence of androgens which are normally present only in males. Behavioral and biological responses associated with high and low levels of aggression in TA and TNA mice are reviewed. Line differences have been found in olfactory communication and marking behavior, in maternal and predatory aggression in females, in locomotor activity, and in learning abilities. Also, correlated neurochemical and endocrinological responses to the selection have been detected. Maternal factors during the preweaning period do not significantly affect the development of aggression in TA and TNA males, while early postweaning exposure to aggression or sex enhanced later aggressive and sexual activity. Early experience and genetic disposition for aggression are correlated, with TA males showing the greatest increase in the behaviors studied.

Key Words

Aggressionselective breedingheritabilityY chromosomegenetic correlationolfactionexploratory activitymaternal aggressionpredatory aggressionsexual behaviortestosteroneserotonincathecholaminescrossbreedingearly experiencemouse

Copyright information

© Plenum Publishing Corporation 1996

Authors and Affiliations

  • N. Kenneth Sandnabba
    • 1
  1. 1.Department of PsychologyÅbo Akademi UniversityTurku-ÅboFinland