Spermatozoa Morphology during the Breeding Season in Thoroughbred Stallions in Japan

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  • KOYAGO Masanori
    Department of Large Animal Clinical Sciences, Graduate School of Veterinary Medicine, Rakuno Gakuen University
  • NAKADA Ken
    Department of Large Animal Clinical Sciences, Graduate School of Veterinary Medicine, Rakuno Gakuen University
  • TSUNODA Nobuo
    Shadai Corporation
  • MORIYOSHI Masaharu
    Department of Large Animal Clinical Sciences, Graduate School of Veterinary Medicine, Rakuno Gakuen University
  • SAWAMUKAI Yutaka
    Department of Large Animal Clinical Sciences, Graduate School of Veterinary Medicine, Rakuno Gakuen University

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  • 日本のサラブレッド種雄馬における繁殖シーズンの精子形態
  • Theriogenology: Spermatozoa morphology during the breeding season in Thoroughbred stallions in Japan

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The morphology of spermatozoa of modern Thoroughbred stallions in Japan was investigated during the breeding season. A total of 299 semen samples were collected from the penises of 16 stallions immediately after service. The rate of abnormalities in sperm heads and tails, spermatozoa with cytoplasmic droplets and slides with medusa cells to total observed slides in each stallion were 3.9 ± 2.1%, 11.5 ± 5.9%, 2.4 ± 2.6% and 20.1%, respectively. The values for the area, length, width and aspect ratio of the stallion sperm head were 12.54 ± 1.34 μm2, 5.93 ± 0.40 μm, 2.69 ± 0.21 μm and 0.46 ± 0.05, respectively. With the exception of medusa cells, the features were significantly different among the stallions (P<0.05).<br>

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