眼球摘出ウズラの光周期-生殖腺反応に対する短日及び低温処理の影響(畜産学)

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It is well established that the photoperiod influences the gonadal activity of birds in temperate zones. Recently, it has been demonstrated that the eyes are not necessary for the photoperiodic gonadal response in the birds. The purpose of this study is to examine the effect of the short-day treatment and ambient low temperature on the testicular response of Japanese quails. The male quails which were reared under continuous light (24L : 0D) from the hatching to 8 weeks of age were employed as experinental fowls [Step 1]. When the birds were transferred from 24L to a short-day (6L : 18D), a significant and remarkable reduction in the cloacal activity were observed within 3 weeks. Then, a half of the birds were enucleated bilaterally. The blind and intact birds were received a short-day treatment until 15 weeks of age [Step 2]. They were divided into 4 lots, being as follows : 1) NC : intact and temperature controls, 2) NL : intact and ambient low temperature, 3) EC : blind and temperature controls, and 4) EL : blind and ambient low temperature. The birds in NL and EL lots were experienced ambient low temperature during the 2nd long-day (24L) treatment for 3 weeks [Step 3]. Thereafter, all lots of birds were transferred from 24L to the short photoperiod for 6 weeks and almost all the testes and cloacal glands of them showed the resistance against involution [Step 4]. These results suggest that the short-day treatment over long period is necessary to induce the resistance of the testes and cloacal glands against involution by the 2nd short-day treatment and that the eyes and experience of ambient low temperature are not essential for the gonadal response to photoperiod in the male Japanese quails.

眼球摘出ウズラの光周期-生殖腺反応に対する短日及び低温処理の影響(畜産学)

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