Abstract
IT HAS been reported that environmental temperature only modifies the photoperiodic effects on avian testicular development (Burger, 1948; Farner and Mewaldt, 1952; Engels and Jenner, 1956), while in certain poikilotherms (Anolis carolinensis), Licht (1966), testicular growth is controlled by the environmental temperature. In Japanese quail testicular growth starts on about the 70th day after hatching when they are reared from hatching under 8-hour daily photoperiods and the mature state of testes is maintained for a long time (Konishi et al., 1965). This maintenance of the mature state in adult male might be caused by rearing under a constant and relatively high temperature of about 26°C. as reported in turkeys (Law and Kosin, 1958) and pheasants (Nagra and Meyer, 1964). Experiments were carried out to investigate the effect of environmental temperature on the testicular growth in Japanese quail held on 8-hour photoperiods.MATERIALS AND METHODSQuail which had a cloacal gland .
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