In order to study the possible role on prolactin secretion of the catecholamines present in ectopic pituitaries, female rats bearing an anterior pituitary graft under the kidney capsule since day 30 of life and their sham-operated controls, were sacrificed at 1,2, 4, 7, 15, 30, 45 and 60 days after the operation. Data obtained showed a significant increase in plasma prolactin levels in grafted rats versus controls from the 4th day on after the grafting (p < 0.01) until the 60th day (p < 0.001). Dopamine content in the ectopic pituitary of grafted rats was higher than in their own in situ pituitaries or on those of sham-operated rats until day 45 being similar to them afterwards. Norepinephrine was also present in the pituitary graft but was not detected in the in situ pituitaries. The grafting of an anterior pituitary gland in an ectopic location was able to induce changes in the local catecholaminergic control of the prolactin secretion.