Ethology: Comparative analysis of vocalizations of thoroughbred mares (Equus caballus) between estrus and diestrus

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  • KIM Young Ki
    Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University
  • SEO Eu Gene
    Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University Equine Clinic Section, Veterinary Center, Korea Racing Authority
  • LEE Scott S.
    Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University
  • SUH Euy Hoon
    Department of Statistics, College of Natural Science, Gyeongsang National University
  • HOUPT Katherine Albro
    Animal Behavior Consultants of Northern Michigan
  • LEE Hee Chun
    Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University
  • LEE Hyo Jong
    Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University
  • YEON Seong Chan
    Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University

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  • Comparative Analysis of Vocalizations of Thoroughbred Mares (Equus caballus) between Estrus and Diestrus

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We investigated the differences between vocalizations of mares in estrus and diestrus and determined the spectrographic parameters to discriminate estrus from diestrus. Thoroughbred brood mares (n=89) were exposed to a teasing procedure for 3 min, and we recorded all vocalizations emitted from them. Among the mares, 56.5% of estrus and 78.6% of diestrus mares emitted calls toward an approaching stallion, indicating that there was higher tendency in the occurrence rate of vocal responses in diestrus than estrus mares. We analyzed the spectrographic data of the mares (25 estrus and 22 diestrus mares) emitting calls in the form of a squeal toward an approaching stallion. Based on broad bandwidth spectrographic analysis, the duration and third formant of the call have a significant effect on discriminating estrus from diestrus.<br>

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