Behavior of rats in various stages of the sexual cycle after injection of noradrenaline into the lateral ventricle of the brain.

The influence of intraventricular injection of 50 microng of noradrenaline (NA) on behavior of female Wistar rats in various phases of the sexual cycle, and the influence of 17-beta-estradiol and progesterone in castrated female rats were studied. Changes in motor and exploratory activity were observed in the course of the sexual cycle in female rats. Sensitivity to NA injected intraventricular varied significantly in different phases of the sexual cycle. Castration depressed the action of NA on motor and exploratory activities in rats, and progesterone prevented the depressive effect of NA in castrated rats.