Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Comparison for immunophysiological responses of Jeju and Thoroughbred horses after exercise

  • Khummuang, Saichit (Department of Animal Science, College of Natural Resources and Life Sciences, Pusan National University) ;
  • Lee, Hyo Gun (Department of Animal Science, College of Natural Resources and Life Sciences, Pusan National University) ;
  • Joo, Sang Seok (Department of Animal Science, College of Natural Resources and Life Sciences, Pusan National University) ;
  • Park, Jeong-Woong (Department of Animal Science, College of Natural Resources and Life Sciences, Pusan National University) ;
  • Choi, Jae-Young (Department of Animal Science, College of Natural Resources and Life Sciences, Pusan National University) ;
  • Oh, Jin Hyeog (Department of Animal Science, College of Natural Resources and Life Sciences, Pusan National University) ;
  • Kim, Kyoung Hwan (Department of Animal Science, College of Natural Resources and Life Sciences, Pusan National University) ;
  • Youn, Hyun-Hee (Department of Animal Science, College of Natural Resources and Life Sciences, Pusan National University) ;
  • Kim, Myunghoo (Department of Animal Science, College of Natural Resources and Life Sciences, Pusan National University) ;
  • Cho, Byung-Wook (Department of Animal Science, College of Natural Resources and Life Sciences, Pusan National University)
  • Received : 2019.03.28
  • Accepted : 2019.07.12
  • Published : 2020.03.01
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Abstract

Objective: The study was conducted to investigate variations in the immunophysiological responses to exercise-induced stress in Jeju and Thoroughbred horses. Methods: Blood samples were collected from the jugular veins of adult Jeju (n = 5) and Thoroughbred (n = 5) horses before and after 30 min of exercise. The hematological, biochemical, and immunological profiles of the blood samples were analyzed. Blood smears were stained and observed under a microscope. The concentration of cell-free (cf) DNA in the plasma was determined using real time polymerase chain reaction (PCR). Peripheral blood mononuclear cells (PBMCs) and polymorphonuclear cells were separated using Polymorphprep, and the expression of various stress-related and chemokine receptor genes was measured using reverse transcriptase (RT) and real-time PCR. Results: After exercise, Jeju and Thoroughbred horses displayed stress responses with significantly increased rectal temperatures, cortisol levels, and muscle catabolism-associated metabolites. Red blood cell indices were significantly higher in Thoroughbred horses than in Jeju horses after exercise. In addition, exercise-induced stress triggered the formation of neutrophil extracellular traps (NETs) and reduced platelet counts in Jeju horses but not in Thoroughbred horses. Heat shock protein 72 and heat shock protein family A (Hsp70) member 6 expression is rapidly modulated in response to exercise-induced stress in the PBMCs of Jeju horses. The expression of CXC chemokine receptor 4 in PBMCs was higher in Thoroughbred horses than in Jeju horses after exercise. Conclusion: In summary, the different immunophysiological responses of Jeju and Thoroughbred horses explain the differences in the physiological and anatomical properties of the two breeds. The physiology of Thoroughbred horses makes them suitable for racing as they are less sensitive to exercise-induced stress compared to that of Jeju horses. This study provides a basis for investigating the link between exercise-induced stresses and the physiological alteration of horses. Hence, our findings show that some of assessed parameters could be used to determine the endurance performance of horses.

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References

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