[The physiological reactions to stress in 3 strains of rats]

We have studied the resistance of Wistar, August, Fisher male rats to 2- and 24-hours immobilization by vegetative and behavioral reactions. The difference in the resistance has been observed both between the three lines of rats and within one particular line. The lowest resistance to stress has been demonstrated by Fisher rats, the highest by Wistar rats. The correlation between emotional reactivity of rats and their response to stress has been shown.