Sex Steroid and Prolactin Profiles in Male American Black Bears (Ursus americanus) during Denning
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概要
- 論文の詳細を見る
Serum sex steroid and prolactin profiles were examined in the male American black bear, Ursus americanus during denning. Sera collected in December and the following March from 8 denning male black bears in Minnesota, U.S.A. were assayed for testosterone, estradiol-17β and prolactin. Eight bears were confirmed to be the denning mode based on a serum urea to creatinine ratio less than 10. Serum testosterone concentrations tended to increase from December to the subsequent March whereas serum estradiol-17β concentrations tended to decrease during this period. There were few changes in serum prolactin concentrations between December and March. These findings suggest that spermatogenesis and testicular steroidogenesis initiated during denning may be influenced by changes in serum sex steroid concentrations in the American black bear.
著者
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Tsubota Toshio
Laboratory Of Ecology Department Of Environmental Veterinary Sciences Graduate School Of Veterinary
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TSUBOTA Toshio
Laboratory of Theriogenology, Faculty of Agriculture, Gifu University, Gifu 501-1193, Japan
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L. GARSHELIS
Minnesota Department of Natural Resources, Forest Wildlife Populations and Research Group, Grand Rapids, MN 55744, U.S.A.
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A. NELSON
Carle Foundation, Department of Internal Medicine, University of Illinois, Urbana, IL 61801 U.S.A.
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M. BAHR
Animal Sciences Laboratory, University of Illinois, Urbana, IL 61801, U.S.A.
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