Serum Zinc Levels and Their Relationship with Diseases in Racehorses

  • MURASE Harutaka
    Equine Science Division, Hidaka Training and Research Center, Japan Racing Association, 535–13 Nishicha, Urakawa-cho, Urakawa-gun, Hokkaido 057–0171, Japan
  • SAKAI Satoshi
    Ritto Training Center, Japan Racing Association, Misono 1028, Ritto-shi, Shiga 520–3005, Japan
  • KUSANO Kanichi
    Miho Training Center, Japan Racing Association, Mikoma 2500–2, Miho-mura, Inashiki-gun, Ibaraki 300–0415, Japan
  • HOBO Seiji
    Department of Domestic Animal Internal Medicine, Clinical Veterinary Science, Veterinary Medicine, Joint Faculty of Veterinary Medicine, Kagoshima University, 1–21–24 Korimoto, Kagoshima-shi, Kagoshima 890–0065, Japan
  • NAMBO Yasuo
    Equine Science Division, Hidaka Training and Research Center, Japan Racing Association, 535–13 Nishicha, Urakawa-cho, Urakawa-gun, Hokkaido 057–0171, Japan

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抄録

Zinc is one of the essential microelements involved in the regulation of enzyme activity, as well as metabolism of nucleic acid and proteins. There have been few reports on equine serum zinc concentrations during the training period, and little is known about the relationship between zinc levels and diseases in horses. In this study, we measured serum zinc levels in healthy Thoroughbred racehorses, as well as in other horses, under general disease or training conditions. The reference value for serum zinc levels in Thoroughbred horses was 41–79 μg/dl. There were no differences in serum zinc levels due to sex or age. Significant decreases in serum zinc levels were observed after training, but serum zinc levels did not vary with intensity of sweating. Serum zinc levels were lower in horses clinically diagnosed as having shipping fever (36.3 ± 2.7 μg/dl), fever (45.3 ± 3.0 μg/dl) and cellulitis (44.0 ± 3.4 μg/dl), as compared to control values (59.7 ± 9.7 μg/dl). They also tended to decrease in experimentally infected horses one day after inoculation. Changes in serum zinc levels reached nadir one day after surgical invasion, except for a horse that experienced complicating shock. These results suggest that zinc is a serological indicator of inflammatory status in Thoroughbred horses.

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