Pheromonal Facilitation of Ovulation in the Immature Mouse

Summary. Facilitation of pmsg- or hcg-induced ovulation occurs in the immature female mouse exposed to the presence of, but not in contact with, an adult male. The effect is not seen if an immature or castrated adult male is used. Removal of the olfactory bulbs in the female also prevents facilitation due to the presence of the male. It is suggested that a number of different effects seen in the female due to a pheromone released by the male may be mediated through a single environmental stimulus.