Prolactin secretion in the male rat has been demonstrated under certain conditions (Zeilmaker, 1963; De Voe, Ramirez & McCann, 1965; Deis, 1967). Little is known, however, of its functional significance or of the mechanism controlling its secretion in the male. We have recently reported (Arai, Kubokura, Suzuki & Masuda, 1970) striking lactogenic changes in the male mammary glands within 2 days of a single injection of reserpine without oestrogen priming. In the present study, the time course of these changes in the male mammary gland was followed in a number of rats killed at various intervals after a single injection of reserpine.
Male Wistar rats (57–60 days old), weighing 180–220 g, received a single injection of reserpine (1 mg Triserpine (Torii Pharmaceutical Co., Tokyo)/kg) or of a placebo made by the manufacturers for this preparation. At autopsy, the inguinal mammary pads were fixed in Bouin's fluid and embedded in paraffin
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