Evaluation of heat stress response in crossbred dairy cows under tropical climate by analysis of heart rate variability

  • BUN Chan
    Asian Satellite Campus in Cambodia, Nagoya University, c/o Royal University of Agriculture, Dangkor District, Phnom Penh, P.O. Box 2696, Cambodia National Animal Health and Production Research Institute, Trea Village, Str. 371, Sangkat Steung Mean Chey, Khan Mean Chey, Phnom Penh, Cambodia
  • WATANABE Youki
    Department of Veterinary Medical Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
  • UENOYAMA Yoshihisa
    Department of Bioengineering Sciences, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan
  • INOUE Naoko
    Department of Bioengineering Sciences, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan
  • IEDA Nahoko
    Department of Bioengineering Sciences, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan
  • MATSUDA Fuko
    Department of Veterinary Medical Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
  • TSUKAMURA Hiroko
    Department of Bioengineering Sciences, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan
  • KUWAHARA Masayoshi
    Department of Veterinary Medical Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
  • MAEDA Kei-ichiro
    Department of Veterinary Medical Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
  • OHKURA Satoshi
    Department of Bioengineering Sciences, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan
  • PHENG Vutha
    Asian Satellite Campus in Cambodia, Nagoya University, c/o Royal University of Agriculture, Dangkor District, Phnom Penh, P.O. Box 2696, Cambodia

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Abstract

<p>The present study aims to examine the effect of tropical temperatures on autonomic nervous activity in Cambodian dairy cattle by analyzing heart rate variability (HRV). Holter-type electrocardiograms were recorded in adult crossbred cows (Cambodian native × Holstein) either in a sheltered area or under direct sunlight. Rectal temperatures and heart rates increased in animals under direct sunlight as compared to those in the shelter. The power spectral analysis of HRV revealed that three out of the five cows studied underwent a decrease in parasympathetic nervous activity under direct sunlight with the remaining two cows showing no apparent change. The HRV analysis would prove to be a useful tool to reveal information about heat tolerance in dairy cows.</p>

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