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  1. 紀要論文
  2. 琉球大学農学部学術報告
  3. 35号
  1. 部局別インデックス
  2. 農学部

下垂体除去鶏における血中カルシウムレベルの変動と退縮卵胞の出現について(畜産学科)

http://hdl.handle.net/20.500.12000/3893
http://hdl.handle.net/20.500.12000/3893
cce12d89-91c4-4f53-807e-dce771ed3546
名前 / ファイル ライセンス アクション
KJ00000161596.pdf KJ00000161596.pdf
Item type デフォルトアイテムタイプ(フル)(1)
公開日 2008-02-14
タイトル
タイトル 下垂体除去鶏における血中カルシウムレベルの変動と退縮卵胞の出現について(畜産学科)
言語 ja
作成者 仲田, 正

× 仲田, 正

ja 仲田, 正

古謝, 瑞幸

× 古謝, 瑞幸

ja 古謝, 瑞幸

安藤, 伊知郎

× 安藤, 伊知郎

ja 安藤, 伊知郎

Nakada, Tadashi

× Nakada, Tadashi

en Nakada, Tadashi

Koja, Zuiko

× Koja, Zuiko

en Koja, Zuiko

Ando, Ichiro

× Ando, Ichiro

en Ando, Ichiro

アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
内容記述
内容記述タイプ Other
内容記述 産卵鶏において血中カルシウムレベルの調節は主に卵巣から分泌されるエストロゲンによって行われている。一方, 卵巣機能は下垂体前葉より分泌される性腺刺激ホルモンによって支配されている。本実験は産卵鶏において卵巣の上位支配器官である下垂体前葉を除去し, 以後血中カルシウムの変動と卵胞の形態的変化から卵巣のエストロゲン分泌機能の消退状況を推定することにした。血中総カルシウムレベルは, 下垂体除去前において約25mg%であったものが除去後2日目までに直線的な減少を示し, 約10mg%レベルになった。以後実験期間中このような低レベルが維持された。なお, 除去後2日目までの血中カルシウムの急激な低下過程において, 除去30分後の血中カルシウム値はすでに除去前のそれと比較して有意な(P<0.05)減少を示した。下垂体除去後の卵胞の退縮は14&acd;16時間後において殆どの最大卵胞に出現し, 17&acd;19時間後および24時間後においては第二および第三卵胞にまで波及した。これらの結果から下垂体除去後卵巣のエストロゲン分泌能力は速かに低下し,それに伴って卵胞の退縮が進行するものと思われた。
内容記述タイプ Other
内容記述 Changes in the concentration of the total calcium in the blood plasma and the rate of follicular atresia were examined to estimate the change of estrogen level after removal of hypophysis in the domestic fowl. The total plasma calcium level of about 25mg% prior to hypophysectomy decreased linearly to about 10mg% by 2 days after operation, while in sham operated hens, the calcium level changed within the limit of about 25mg% during the same period. On the process of the declination of the plasma calcium level by 2 days after hypophysectomy, the calcium values already showed a significant decrease at 30 min. after operation in comparison with that of the pre-operation (P<0.05). From 2 days after operation throughout the experimental period for 5 days, the calcium level was maintained at a low level of about 10mg%. Ovarian follicles exhibited a differential rate of atresia due to follicular size following hypophysectomy. Atresia appeared first in the largest follicle at 14-16 hr. postoperatively, in 2nd by 17-19hrs., and in 3rd by 24hr. These results suggest that the secretion of estrogen which is mainly responsible for raising the concentration of the blood calcium may be abruptly terminated by hypophysectomy whereas the rate of ovarian regression advanced with decreasing the level of the blood calcium which is closely associated with ovarian activity.
内容記述タイプ Other
内容記述 紀要論文
出版者
言語 ja
出版者 琉球大学農学部
言語
言語 eng
資源タイプ
資源タイプ departmental bulletin paper
資源タイプ識別子 http://purl.org/coar/resource_type/c_6501
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
識別子
識別子 http://hdl.handle.net/20.500.12000/3893
識別子タイプ HDL
収録物識別子
収録物識別子タイプ ISSN
収録物識別子 0370-4246
収録物識別子タイプ NCID
収録物識別子 AN00250548
収録物名
言語 ja
収録物名 琉球大学農学部学術報告
書誌情報
号 35, p. 73-78
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