Abstract
The purpose of this study was to assess the effects of artificial shade, tree shade, and no shade on physiological changes, oxidative stress, and total antioxidant power in Thai Brahman cattle. Twenty-one cattle were divided into three groups: cattle maintained under artificial shade, under tree shade, and without shade. On days 1, 7, 14, 21, and 28 of the experimental period, after the cattle were set in individual stalls for 2 h, physiological changes, thiobarbituric acid reactive substances (TBARS), and total antioxidant power were investigated. The results revealed that the respiratory rate, heart rate, sweat rate and the neutrophil/lymphocyte ratio of the no-shade cattle were significantly higher than those of cattle maintained under artificial shade and tree shade (P < 0.05). During the early period of heat exposure, the total antioxidant power of the no-shade cattle was lower than those of cattle maintained under artificial shade and tree shade, but the total antioxidant power of cattle maintained under artificial shade and tree shade were not different (P > 0.05). However, rectal temperature and packed cell volume of the cattle in all groups did not differ (P > 0.05). These results showed that artificial shade and tree shade can protect cattle from sunlight compared to no shade, and that the effectiveness of tree shade for sunlight protection is at an intermediate level.
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This research was funded by Mahasarakham University. The authors would like to thank the Faculty of Veterinary Medicine and Animal Science, Mahasarakham University for laboratory support.
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Aengwanich, W., Kongbuntad, W. & Boonsorn, T. Effects of shade on physiological changes, oxidative stress, and total antioxidant power in Thai Brahman cattle. Int J Biometeorol 55, 741–748 (2011). https://doi.org/10.1007/s00484-010-0389-y
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DOI: https://doi.org/10.1007/s00484-010-0389-y