ふ卵4日目にエストロジェンを投与した日本ウズラ雄胚子の生殖腺および副生殖器官の変化

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タイトル別名
  • Variations in Feminization of the Gonads of Male Embryos Given Various Amounts of Estrogen on Day 4 of Incubation in the Japanese Quail
  • フラン 4ニチメ ニ エストロジェン オ トウヨシタ ニホン ウズラ ユウ ハ

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抄録

Regarding the feminization of gonads of male embryos of the Japanese quail, the previous reports from our laboratory showed that estrogen exerted the most striking effect when administered to the embryos on day 4 of incubation, as compared with effects produced by the administration on any other day of incubation. In the experiments reported here, day 4 of incubation was selected as day of injection. The amounts of estradiol benzoate to be injected as the estrogen were graded as 0.005, 0.01, 0.02 and 0.04 mg, in order to determine the amount of estrogen which was the most effective in feminizing the male embryonic gonads and the accessory sexual organs in the quail. The eggs were obtained by mating sex-linked white males with wild-type females. The sex of embryos was easily distinguished at the time of examination on day 16 of incubation, according to the plumage appearance (males were wild-type). The administration of either 0.02mg or 0.04mg estrogen enlarged the left testis, as compared with the controls. On the contrary, either 0.005mg or 0.01mg estrogen reduced the size of the left testis as compared with the controls. As regards the right testis, the effective amount of estrogen for suppressing its development was more than 0.005mg. Values of the ratio of "right testis/left testis" in length, width and length×width also support these observations. When the degree of feminization was classified into grades (1), (2), (3) and (4) in the order of increasing severity, the grade (1), which stands for no change, occurred with some frequency in the cases of injection of 0.005mg to 0.02mg estrogen, but there was no incidence of embryo belonging to grade (1) in the case of injection of 0.04mg. Consequently, 0.04mg estrogen was the most effective dosage for feminizing the male embryonic gonads, among the four dosages used.

収録刊行物

  • 日本畜産学会報

    日本畜産学会報 48 (12), 766-771, 1977

    公益社団法人 日本畜産学会

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