長日あるいは短日周期下で育雛したウズラの卵巣発育の遅延

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タイトル別名
  • Delay of Ovarian Development in Japanese Quail Reared under Short or Long Ahemeral Cycles.
  • Delay of Ovarian Development in Japanes

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This study was designed to investigate the influence of day length on sexual maturity in female Japanese quail (Coturnix coturnix japonica). At 10 days of age, chicks were divided into four groups; 21H (14L:7D), 24H (16L:8D), 27H (18L:9D) and 30H (20L:10D). At 20, 30, 40 and 50 days of age, 9-10 birds from each group were selected randomly, weighed, and slaughtered to determine ovary weight and the number of ovarian follicles. The age at the first egg and the egg production rate were recorded until 70 days of age. Overy weights in 21H, 27H and 30H at 40 days of age were significantly less than that of birds in 24H (P<.01). At 50 days of age, however, no significant differences were found among groups in ovary weight. The egg production rate was also highest in 24H and the difference between 24H and 30H was statistically significant (P<.01). It was suggested that the female quail exposed to ahemeral light/dark cycle might be influenced only in the early stage of ovary growth, but thereafter, compensatory growth might occur and restore the delay of growth.

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