Characteristics of Two Lines of Japanese Quail Selected for Response to "Continuous Light Treatment"(Endocrinology)

概要

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Two lines of Japanese quail were divergently selected for cloacal gland response to "continuous light treatment" (CLT) in males and for age at first egg in females through four generations. Males responded to CLT and females laid eggs at earlier ages and between 08 : 30 and 14: 00 in a day were selected as KR line. The sires and dams of KN line were males unresponsive to CLT and females laid eggs at later ages and between 16 : 30 and 08 : 30. Remarkable cloacal gland growth by CLT was observed in KR line through all the generations examined. Percentages of the responsive birds to CLT for KR and KN lines of the fourth generation were 83.4% and 2.8%, respectively. Average ages of females laid the first egg were significantly earlier in KR than in KN line from the first generation to the fourth generation. Gonadal growth was faster and serum testosterone concentration was higher in KR than in KN line of the fourth generation. The body weight and cloacal gland size of the fourth generation were significantly larger in KR than in KN line. The cloacal gland of KR line attained maximum size by 70 days of age under short photoperiod but maturation of the cloacal gland in KN line was retarded considerably.
社団法人日本動物学会の論文
1985-08-15