Basal Levels and GnRH-induced Responses of Peripheral Testosterone and Estrogen in Holstein Bulls with Poor Semen Quality
スポンサーリンク
概要
- 論文の詳細を見る
The present study investigated the basal levels and GnRH-induced responses of peripheral testosterone and estrogen in Holstein bulls with poor semen quality. On the basis of semen parameters, bulls (n=5) having poor semen quality were selected as experimental bulls, and good semen quality bulls (n=4) were used as control bulls. Both groups were treated intramuscularly once with GnRH (250 μg of fertirelin acetate). Blood samples were collected at -1 day (d), -30 min and 0 h (treatment) followed by every 30 min for 5 h and 1, 3 and 5 d post-GnRH treatment (PGT), and LH, testosterone and estradiol-17β (E2) concentrations were measured. The pretreatment concentrations were used as basal levels. The percentage increments based on the 0-h levels were calculated per bull for each sampling time until 5 h PGT, and differences were compared between the experimental and control groups. The PGT concentrations of testosterone and basal and PGT concentrations of E2 were significantly lower in the experimental group. The testosterone increment in the experimental group was delayed and significantly lower from 1 to 5 h PGT than those in the control group. It can be suggested that bulls with poor semen quality have delayed and lower GnRH-induced testosterone response and may also have lower estrogen levels.
著者
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佐々木 基樹
東京大学総合研究博物館
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TAKAHASHI Ken-Ichi
Genetics Hokkaido
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MATSUZAKI Shigenori
Genetics Hokkaido
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Miyamoto Akio
Graduate School of Animal and Food Hygiene, Obihiro University of Agriculture & Veterinary Medicine
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MATSUI Motozumi
Department of Clinically Veterinary Sciences, Obihiro University of Agriculture and Veterinary Medic
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松崎 重範
Genetics Hokkaido
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Miyamoto Akio
Graduate School Of Animal And Food Hygiene Obihiro University Of Agriculture And Veterinary Medicine
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DEVKOTA Bhuminand
Department of Veterinary Medicine, Obihiro University
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YAMAGISHI Norio
Faculty of Agriculture, Iwate University
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OSAWA Takeshi
Faculty of Agriculture, Iwate University
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HASHIZUME Tsutomu
Faculty of Agriculture, Iwate University
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IZAIKE Yoshiaki
Faculty of Agriculture, Iwate University
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MIYAKE Yoh-Ichi
Department of Veterinary Medicine, Obihiro University
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Hashizume Tsutomu
Faculty Of Agriculture Iwate University
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Matsui Motozumi
Department Of Clinically Veterinary Sciences Obihiro University Of Agriculture And Veterinary Medici
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高橋 健一
Genetics Hokkaido
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