TESTICULAR CHANGES IN THE JUVENILE PIGEON DUE TO PROGESTERONE TREATMENT1

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Abstract
Intramusc. injns. of progesterone (0.5 mg. daily for 30 days) into 60-day-old pigeons elicited a significant increase in testicular wts. Evidence is presented that the seminiferous epithelium was converted from a cuboidal state in the control males to a stratified shape in the hormone-treated ones. There was also a marked increase in number of the Leydig cells in the progesterone recipients. It is suggested that these changes were induced by the hormone through the augmentation of FSH and ICSH output of the anterior hypophysis.