Abstract
The oestrus that is normally induced in unisexually grouped females following expposure to males was inhibited when females were intranasally irrigated with zinc sulphate (1.0 mg in 0.05 ml physiological saline). The results suggest that the irrigation caused complete blockade of olfactory perception, rendering the females anosmic, and hence they failed to perceive the pheromone emanating from the males. The results supported the concept that the oestrus-inducing pheromone of male origin acts through olfactory pathways.
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