Effects of Semen Extenders and Storage Temperatures on Characteristics of Frozen-Thawed Brydes (Balaenoptera edeni) Whale Spermatozoa
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概要
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The present study investigated effects of three semen extenders and storage temperatures on post-thaw characteristics of Brydes whale spermatozoa. Spermatozoa were collected from the vasa deferens of three mature Brydes whales captured during the Japanese whale research in the north-west Pacific (May to August 2007) after death. The three semen extenders used for freezing were 1) a commercialized synthetic extender (AndroMed: AM), 2) Tris-based + 10% bovine serum albumin (BSA) and 3) Tris-based + egg yolk (EY). The sperm samples from the three whales were frozen with the three extenders, and the post-thaw spermatozoa were stored at three different temperatures (35 C; 20-25 C, room temperature; and 5 C) for 0, 6, 12, 24, 48 and 96 h. At each time-point, total and progressive motility (PM), viability (live or dead), the hypo-osmotic test, defective acrosomes and malformation were examined. Immediately after thawing, AM resulted in similar recovery rates (60.4 and 83.3%) in 2 of the 3 whales examined and had comparable post-thaw recovery rates to those obtained using the EY and BSA extenders. Immediately after thawing, the proportion of PM in EY (17.6%) was higher (P< 0.05) than that in BSA (15.0%). In the hypo-osmotic test, the proportions of AM (26.0%) and BSA (25.2%) were higher (P<0.05) than that of EY (17.3%). The three extenders had similar viabilities (36.7, 37.9 and 32.1%, respectively), but the viability of BSA was higher (P< 0.05) than that of EY. The present study showed that a synthetic semen extender, AndroMed, could be used for cryopreservation of whale spermatozoa in addition to Tris-based extenders containing bovine serum albumin or egg yolk. Storage of the post-thaw Brydes whale spermatozoa was better at 5 C than at room temperature or 35 C. The frozen-thawed Brydes whale spermatozoa maintained their motility and viability for at least two days at room temperature and for four days at 5 C.
- 日本繁殖生物学会の論文
著者
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Fujise Yoshihiro
The Institute of Cetacean Research
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Hirabayashi Masumi
自然科学研究機構生理学研究所
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Hirabayashi Masumi
Laboratory Of Animal Reproduction Obihiro University Of Agriculture And Veterinary Medicine
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Hirabayashi Masumi
信州大学 繊維
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FUKUI Yutaka
Laboratory of Animal Reproduction, Obihiro University of Agriculture and Veterinary Medicine
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WATANABE Hiroyuki
Laboratory of Animal Reproduction, Obihiro University of Agriculture and Veterinary Medicine
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ISHIKAWA Hajime
The Institute of Cetacean Research
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OHSUMI Seiji
The Institute of Cetacean Research
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Suzuki Yo
Laboratory Of Animal Reproduction Obihiro University Of Agriculture And Veterinary Medicine
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Fukui Yutaka
Laboratory Of Animal Reproduction Obihiro University Of Agriculture And Veterinary Medicine
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Bhuiyan Mohammad
Laboratory Of Animal Reproduction Obihiro University Of Agriculture And Veterinary Medicine
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HIWASA Mami
Laboratory of Animal Reproduction, Obihiro University of Agriculture and Veterinary Medicine
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MATSUOKA Kohji
The Institute of Cetacean Research
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BHUIYAN Mohammod
Laboratory of Animal Reproduction, Obihiro University of Agriculture and Veterinary Medicine
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Watanabe H
Laboratory Of Animal Reproduction Obihiro University Of Agriculture And Veterinary Medicine
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Hiwasa Mami
Laboratory Of Animal Reproduction Obihiro University Of Agriculture And Veterinary Medicine
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Watanabe Hiroyuki
Laboratory Of Animal Reproduction Obihiro University Of Agriculture And Veterinary Medicine
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Fukui Yutaka
Laboratory Of Animal Genefics And Reproduction Obihiro University Of Agriculture And Veterinary Medi
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Suzuki Yo
Laboratory of Animal Reproduction, Obihiro University of Agriculture and Veterinary Medicine
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OHSUMI Seiji
The Whales Research Institute
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