Effects of Preovulatory Tranquilization with Xylazine on the Timing of Ovulation in the Horse

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  • PETROFF Brian K.
    Center for Reproductive Sciences, University of Kansas Medical Center Department of Internal Medicine, University of Kansas Medical Center
  • CIERESZKO Renata E.
    Department of Animal Physiology, University of Warmia and Mazury
  • NAKAI Rie
    Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • WAGNER Keith L.
    Equine Health Solutions
  • WATANABE Gen
    Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • TAYA Kazuyoshi
    Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology

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Xylazine is the most commonly used equine tranquilizer but its effects on ovulation and periovulatory endocrinology have not been tested in the mare. In this study, mares received xylazine (0.5 mg/kg IV) or vehicle during synchronized follicular development. The diameter of the dominant ovarian follicle was monitored every twelve hours by ultrasonography and the time of ovulation was recorded. Serum concentrations of luteinizing hormone (LH), follicle stimulating hormone (FSH) and progesterone were measured by radioimmunoassay. Xylazine transiently but significantly increased concentrations of FSH. LH and progesterone profiles as well as follicular diameters and the timing of ovulation were similar following treatment with xylazine or vehicle. A single tranquilizing dose of xylazine is unlikely to alter ovulation in the mare.<br>

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