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      Effects of shade on physiological changes, oxidative stress, and total antioxidant power in Thai Brahman cattle.

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          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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          Author and article information

          Journal
          Int J Biometeorol
          International journal of biometeorology
          Springer Nature America, Inc
          1432-1254
          0020-7128
          Sep 2011
          : 55
          : 5
          Affiliations
          [1 ] Stress and Oxidative Stress in Animal Research Unit, Mahasarakham University, Thailand. worapol.a@msu.ac.th
          Article
          10.1007/s00484-010-0389-y
          21128086
          63eccd67-06ef-4d4f-b7be-127949d0e7bc
          History

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