Testosterone and Sex Related Physical Characteristics during the Maturation of the Male Japanese Quail (Coturnix coturnix japonica)

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Abstract
A series of experiments was conducted to examine hormonal and physical aspects of reproduction in the maturing and adult male Japanese Quail. Testicular secretion of testosterone was demonstrated in the adult male by the elevated testosterone concentration in the testicular vein (12 ng/ml serum) as compared to the testosterone concentration in the left ventricle (4.5 ng/ml serum). Testosterone concentrations in the peripheral circulation were found to vary diurnally with high concentrations in the morning and evening and lowered concentrations in the midafternoon.