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In mammals, it is well known that a long-continued treatment with sex steroids results in a depression of the gonadotropic activity of the anterior hypophysis. On the other hand, in mammals and birds, it is well established that lengthened daily light-period stimulates the anterior hypophysis to secrete gonadotropins. Clavert(1951)has demonstrated that thyroxin suppresses the ovarian growth of the pigeons treated with gonadotropins, but does not inhibit the oviducal growth of the birds. The purpose of this communication is to present the results of the investigations designed to examine the effect of sex steroids and thyroid extract on the gonadotropic activity of the anterior hypophysis and the gonadal development in the birds artificially subjected to a lengthened daily light-period. It is a pleasure to express my gratitude to Prof. K. Takewaki for his helpful criticism and encouragement.

endocrinologia japonica

INHIBITION BY SEX STEROIDS AND THYROID SUBSTANCE OF LIGHT-INDUCED GONADAL DEVELOPMENT IN THE PASSERINE BIRD, &lt;I&gt;ZOSTEROPS PALPEBROSA JAPONICA&lt;/I&gt;