Abstract
Relatively little is known about the time when the stallion reaches puberty. In the Anglo-Norman breed the testes have been shown to increase gradually in weight from the 11th month onwards, and then more rapidly from the 16th month (Nishikawa & Horie, 1955). Large amounts of testosterone have been found in the spermatic vein blood of mature stallions (Lindner, 1959, 1961). It has also been postulated that the rise in urinary oestrogen excretion accompanies sexual maturation at 20 months (Zondek, 1934; Pigon, Lunaas & Velle, 1961). The object of the present experiment was to study sexual development in living pony stallions from birth until the time when spermatozoa appear in ejaculates, and to define the time relationship between the onset of androgenic and gametogenic testicular functions. In addition, a study was made of the effects of season on
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