Kaplan, J. R., Manning, P., Zucker, E. 1980. Reduction of mortality due to fighting in a colony of rhesus monkeys (Macaca mulatta). Laboratory Animal Science 30, 565-570.

Mortality resulting from fighting [17 deaths per 100 females per year] in a breeding colony of rhesus monkeys living in groups was an important management problem. It was found that the cause of the fighting was the social disruption resulting from a breeding protocol which required the regular removal of pregnant animals from groups and introduction of nonpregnant females.