ホルスタイン種雄牛の加齢にともなう血中ホルモン濃度の変化
スポンサーリンク
概要
- 論文の詳細を見る
It has been well demonstrated that the quantity and quality of the semen obtained from bulls improve with age. To understand the relationship between the semen characteristics and hormonal conditions in Holstein bulls, age-related changes in serum levels of inhibin, FSH, LH and testosterone were investigated. One hundred three Holstein bulls were divided into 11 age-groups as 2.5 (n=10), 6.5 (n=10), 12 (n=12), 24 (n=9), 36 (n=10), 48 (n=12), 60 (n=13), 72 (n=8), 84 (n=5), 96 (n=8) and 108 (n=6) months old. Serum levels of inhibin, FSH, LH and testosterone were measured by specific radioimmunoassays. Serum levels of inhibin were highest in bull calves before 12 months of age, and significantly decreased at 12 months old and remained low thereafter. In contrast to inhibin, serum levels of gonadotropins and testosterone were low in young bulls, and then increased with age. In summary, the concentrations of inhibin, gonadotropins and testosterone in serum changed with age in Holstein bulls.
- 日本繁殖生物学会の論文
著者
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WATANABE Gen
Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Toky
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TAYA Kazuyoshi
Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Toky
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OKUDA Kiyoshi
Laboratory of Reproductive Endocrinology, Okayama University
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Kitamura Nobuo
Department of Cardiovascular Surgery, Kyoto Prefectural University of Medicine
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松崎 重範
帯広畜産大学
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UENOYAMA Yoshihisa
Laboratory of Animal Reproduction, Graduate School of Bioagricultural Sciences, Nagoya University
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奥田 潔
Laboratory Of Reproductive Endocrinology Graduate School Of Natural Science And Technology Okayama U
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Yamada Junzo
Department Of Veterinary Anatomy Obihiro University Of Agriculture And Veterinary Medicine
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松崎 重範
Department of Veterinary Anatomy, Obihiro University of Agriculture and Veterinary Medicine, Obihiro
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上野山 賀久
Laboratory of Reproductive Endocrinology, Okayama University, Okayama 700-8530, Japan
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MATSUZAKI Sigenori
Department of Veterinary Anatomy, Obihiro University of Agriculture and Veterinary Medicine, Obihiro
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