Effect of anosmia on the behavior of standard non-aggressive male mice opponents during agonistic encounters

Abstract

This study assessed whether the differences observed in a previous experiment [Martinez M, Salvador A, Simon VM (1994): Aggressive Behavior 20:441-451] in the behavior of isolated male mice over several agonistic encounters in which they confronted either an "anosmic" or an "intact" non-aggressive "standard opponent" were due to the differences in the behavior of the opponents themselves. Ethologically-inspired analysis was used to assess the behavior of the opponents during the first agonistic encounter. Anosmic opponents spent less time in social investigation and defense and more time in immobility than intact ones. These results suggest that the differences in the behavior of the opponents could be one of the causes of the differences observed in the behavior of the aggressive males confronting them. However, more research is needed to study if other variables, such as the production of odors, are also affected by the state (deprived or intact) of the olfactory sense. These findings provide additional support for the view that the type of opponent used in studies on intermale aggression is of paramount importance. Aggr. Behav. 23:179-181, 1997. © 1997 Wiley-Liss, Inc.