Effects of a short period of isolation in adulthood on the aggressive behavior of dominant and subordinate male mice
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Male ddY mice were used to investigate the effect of a short period of isolation in adulthood on aggressive behavior. The relationship between the dominance status previous to isolation and the effect of isolation was investigated. The mice were kept in isolation for 3 weeks from 9 weeks of age, during which intruder tests were conducted once a week. They the went through an encounter test, in which the mice encountered dominant or subordinate mice in a neutral space.
The number of the formerly-dominant isolated mice that attacked the intruder mice decreased at first and then increased. The latency to attack also lengthened at first and then shortened. Seven former-dominants continued to show aggression throughout the intruder The number of the formerly-subordinate isolated mice that attacked the intruder mice increased linearly. But 3 former-subordinates did not show aggression through the entire experiment. After 3 weeks isolation, the number of mice that showed aggression and the amount of aggression did not differ between the former-dominants and subordinatcs. Isolation housing was concluded to differentially affect the dominant and subordinate mice during the 3 weeks of isolation. It was also concluded to differentially affect the mice of absolute dominance and relative dominance differentially. The aggressive behavior of the isolated mice appears to occur independently of site.
KeywordsAggressive Behavior Male Mouse Animal Ecology Relative Dominance Entire Experiment
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- Cairns, R.B. & J.S. Nakelski 1971 On fighting in mice: ontogenetic and experiential determinants.J. Comp. Physio. Psychol. 74(3): 354–364.Google Scholar
- Cairns, R.B. & S.D. Scholz 1973 Fighting in mice: dyadic escalation and what is learned.J. Comp. Physio. Psychol. 85(3):540–550.Google Scholar
- Cairns, R.B., K.E. Hood & J. Midlam 1985 On fighting in mice: is there a sensitive period for isolation effects?Anim. Behav. 33:166–180.Google Scholar
- Goldsmith, J.F., P.F. Brain & D. Benton 1976 Effects of age at differential housing and the duration of individual housing/grouping on intermale fighting behavior and adrenocortical activity in TO strain mice.Aggressive Behav. 2:307–323.Google Scholar
- Kaufmann, J.H. 1983 On the definitions and functions of dominance and territoriality.Biol. Rev. 58:1–20.Google Scholar
- Koyama, S. 1985 The effects of social deprivation on the social behavior of mice (Mus musculus).Ann. Anim. Psychol. 35:79–90 (in Japanese with English abstract).Google Scholar
- Koyama, S. 1993a Isolation effect in mice (Mus musculus): (i) does it really induce aggression?J. Ehtol. 11:117–130.Google Scholar
- Koyama, S. 1993b Isolation effect in mice (Mus musculus): (ii) variance in aggression.J. Ethol. 11:131–140.Google Scholar