Summary
Testosterone pellets implanted in the third ventricle inhibited completely photostimulated testicular growth in the Japanese quail (Coturnix coturnix). Crowing was induced by intraventricular testosterone in quail with undeveloped testes. Intraventricular cholesterol pellets did not inhibit testicular growth. In these birds crowing occurred normally. When the testosterone implants were located in the nucleus tuberis, photoperiodically induced testicular growth was also prevented. Testosterone implants in several other nuclei did not impair testicular growth. These observations suggest that testosterone is involved in the hypothalamo-gonadal negative feedback mechanism in this species, and the nucleus tuberis is the site of tetsosterone action.
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The author wishes to express his gratitude to Professor Hideshi Kobayashi for his valuable guidance during the course of this study, and also to Professor H. A. Bern for his kindness in reading the manuscript. This investigation was supported in part by a Grant-in-Aid for Scientific Research from the Ministry of Education of Japan and a Grant from Population Council (M67.133).
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Wada, M. Effect of hypothalamic implantation of testosterone on photostimulated testicular growth in Japanese quail (Coturnix coturnix japonica). Z. Zellforsch. 124, 507–519 (1972). https://doi.org/10.1007/BF00335254
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DOI: https://doi.org/10.1007/BF00335254