鳥類の蕃殖生理に関する研究 II．ジュズカケ鳩に於ける排卵に対する光線の影響に就いて

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  • Studies on the physiology of reproduction in birds. II. On the effects of light on the ovulation in ring doves
  • 鳥類の蕃殖生理に関する研究-(2)ジユズカケ鳩に於ける排卵に対する光線の影響に就いて-
  • チョウルイ ノ ハンショク セイリ ニ カンスル ケンキュウ 2 ジユズカケ ハト ニ オケル ハイラン ニ タイスル コウセン ノ エイキョウ ニ ツイテ

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説明

(1)In order to study the effects of light on the ovulation as well as the behavior of egg-laying in ring doves, they have been kept in a dark room of an area of 3780 square feet, where three 100 W electric lamps are able to be turned on throughout the night, and inversely, they are to be turned out throughout the day. This lightening is carried out automatically with a time switch made in Switzerland. Thus, night and day are reversed completely in the dark room. (2) Ring doves breed successfully in the dark room adapting themselves to the environment artificially arranged, and they lay the first eggs of clutch toward the end of daytime of the room, and second ones in the beginning of daytime two days later. The time interval which is necessary for the adaptation has been found to be more than three days, but less than 7 days, counting from the day of laying of the first egg of clutch. (3) It was foud that there exists a relation between the light and the ovulation in ring doves. When ring doves are transferred from normal cages to those in the dark room at the time of 27-34 hours before the laying of first eggs of clutch the dark room being dark, the second ovulation of the clutch delay presumably more than ten hours, the second egg-laying of clutch occurring from fifty to seventy hours after the first egg-laying. (4) Consideration on the delay of the ovulation of the second ovum of clutch in such situations was made by the writers in reference to hormones of anterior and posterior lobes of pituitary as well as progesterone.

哺乳動物に於ては排卵が脳下垂体の生殖腺刺激ホルモンの作用によりて，人為的に，惹起され得ることは既に知られた事実である．然るに鳥類に於ては多くの実験が為されて居るにも拘らず，哺乳動物に於けるが如く簡単に排卵が惹起されない．鳥類排卵の機構を把握することは，畜産上産卵養鶏の見地よりして重要なる課題となるが故に，筆者などの研究室に於ては夙にこの問題を採上げ，産卵習性の極めて明確なジュズカケ鳩を用ひて研究の歩を進めて居る．今回光線殊に電燈照射の有無により排卵が作用を受ける事実を認め得たので，排卵機構究明の一端として，ここに実験の結果を報告する．

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