Investigation of usefulness of sperm analyses in dogs for male fertility study.

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  • TAKAGI Hironori
    Toxicology Laboratory, Drug Metabolism and Toxicology Research Center, Taisho Pharmaceutical Co., Ltd.
  • KURIHARA Akiyoshi
    Toxicology Laboratory, Drug Metabolism and Toxicology Research Center, Taisho Pharmaceutical Co., Ltd.
  • INOUE Tadahiro
    Toxicology Laboratory, Drug Metabolism and Toxicology Research Center, Taisho Pharmaceutical Co., Ltd.
  • NAKAMURA Isamu
    Toxicology Laboratory, Drug Metabolism and Toxicology Research Center, Taisho Pharmaceutical Co., Ltd.
  • KIMURA Masaaki
    Toxicology Laboratory, Drug Metabolism and Toxicology Research Center, Taisho Pharmaceutical Co., Ltd.

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The usefulness of sperm analyses in dogs, including sperm motion analysis, was investigated. Sperm motion analysis was performed with the CellSoft-4000 computer-assisted sperm analysis (CASA) system. First, we examined the conditions for preservation of optimal semen quality. We found that sperm retained more of their motility at 4°C than at 37°C. Secondly, we observed sperm motion, concentration and morphology in dog semen continuously for 11 weeks. We collected semen samples during the test period, and the samples retained sperm motion, concentration and morphology. Finally, we administrated α-chlorohydrin, which decreases rodent sperm motion, at a single oral dose of 100 mg/kg or 150 mg/kg to dogs. Sperm motion was inhibited immediately after α-chlorohydrin treatment, and recovered after 2 weeks. None of the experimental animals were sacrificed in the above-mentioned examinations. We thus confirmed that sperm analyses including motion analysis in dogs are useful in male fertility studies.

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