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In 36 newborn puppies, positive responses to the mother hair smell appear immediately after birth which indicates emanation of a corresponding pheromone. Within 6 hrs after isolation from the mother, the preference for her smell is reduced and substituted with a response to hair smell of other females. Learning of the motor to the mother smell seems to… (More)
A 5-min centripetal acceleration made the initially indifferent response to eucalyptus smell negative and the initially positive response to the mother smell uncertain in newborn puppies. The aversion to eucalyptus smell preserved longer than to the mother smell. Prolongation of the acceleration up to 15 min. increased the duration of olfactory aversion.… (More)