Plasma Steroid Hormone Profiles during HCG Induced Ovulation in Female Walking Catfish Clarias batrachus(Endocrinology)
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概要
- 論文の詳細を見る
The present experiment was performed in order to investigate the response of walking catfish to human chorionic gonadotropin (HCG) and the resultant hormonal changes during ovulation. Mature female walking catfish were given a single intramuscular injection of 0.8 IU HCG/g body weight. Of 14 fish treated with a single injection of HCG, 5 fish ovulated at 20 hr and 9 fish at 24 hr following treatment. Germinal vesicle breakdown occurred after an elapse of 12-16 hr. After HCG injection, plasma testosterone peaked at 4 hr, and then gradually decreased to initial levels at 24 hr. Progesterone levels started to increase at 4 hr, and exhibited a small peak at 12 hr. Plasma 17c-hydroxyprogesterone levels began to increase at 8 hr, peaked at 12 hr, and returned to basal levels at 20 hr. Plasma 17α,20β-dihydroxy-4-pregnen-3-one (17α,20β-P)levels suddenly increased and peaked at 12 hr following treatment. 17α,20β,21-trihydroxy-4-pregnen-3-one (20β-S) also increased at 12 hr and peaked at 16 hr. Meanwhile, 17α,20β-dihydroxy-4-pregnen-3-one, a stereoisomer of 17α,20β-P, started to increase at 4 hr, reaching a peak at 12 hr, with maximum levels lower than those of 17α,20β-P or 20β-S. These peaks were concomitant to the first occurrence of GVBD. Plasma estradiol-17β levels in HCG-treated fish remained constant throughout the experiment, whereas levels in the control group were seen to decrease. These results indicate that HCG is effective in inducing ovulation in walking catfish and suggest that 17α,20β-P and/or 20β-S are the maturation inducing steroid(s) in this species.
- 社団法人日本動物学会の論文
- 1992-06-15
著者
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FURUKAWA Kiyoshi
Department of Aquatic Biosciences, Graduate School of Agricultural and Life Sciences, The University
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Aida Katsumi
Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University
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Aida Katsumi
Department Of Aquatic Bioscience Graduate School Of Agricultural And Life Sciences The University Of
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Aida Katsumi
Department Of Aquatic Bioscience Graduate School Of Agricultural And Sciences The University Of Toky
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Asahina K
Univ. Utrecht Utrecht Nld
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Asahina Kiyoshi
College Of Agriculture And Veterinary Medicine Nihon University
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ZAIRIN. Jr.
Department of Fisheries, Faculty of Agriculture, The University of Tokyo
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Zairin. Jr.
Department Of Fisheries Faculty Of Agriculture The University Of Tokyo
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Furukawa Kiyoshi
Department Of Aquatic Bioscience Graduate School Of Agricultural And Life Sciences The University Of
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Furukawa K
Department Of Aquatic Bioscience Graduate School Of Agricultural And Life Sciences The University Of
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Zairin Jr.
Department of Fisheries, Faculty of Agriculture, The University of Tokyo
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