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Osman Valli PATEL
Department of Veterinary Surgery and Obstetrics, Faculty of Agriculture, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113, Japan
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Toru TAKAHASHI
Department of Animal Reproduction, National Institute of Animal Industry, P.O. Box 5, Norindanchi, Tsukuba, Ibaraki 305, Japan
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Makoto HIRAKO
Department of Animal Reproduction, National Institute of Animal Industry, P.O. Box 5, Norindanchi, Tsukuba, Ibaraki 305, Japan
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Tsuneo TOMIZUKA
Department of Animal Reproduction, National Institute of Animal Industry, P.O. Box 5, Norindanchi, Tsukuba, Ibaraki 305, Japan
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Toshiyuki KOJIMA
Department of Animal Reproduction, National Institute of Animal Industry, P.O. Box 5, Norindanchi, Tsukuba, Ibaraki 305, Japan
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Nobuo SASAKI
Department of Veterinary Surgery and Obstetrics, Faculty of Agriculture, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113, Japan
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Ikuo DOMEKI
Department of Animal Reproduction, faculty of Agriculture, Tokyo University of Agriculture, Sakuragaoka, Setagaya-ku, Tokyo 156, Japan