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กระบื อปลั กกั บภาวะเครี ยดจากความร้อน 184 The Journal of the Royal Institute of Thailand Vol. 38 No. 3 July-Sep 2013 Abstract Swamp Buffalo and Heat Stress Narongsak Chaiyabutr Associate Fellow of the Academy of Science, The Royal Institute, Thailand Swamp buffaloes maintain thermal balance by physiological and behavioural processes. During heat stress, an exposure to direct solar radiation either an acute exposure (4-5 hours) or short term exposure (5-10 days) exhibits signs of distress with initiation of panting. During heat exposure, an increase in water turnover reflects adaptation to maintain fluids for evaporative cooling. Heat stress evokes several responses of plasma volume and its composition including changes in potassium metabolism. Acute heat exposure gives rise to a change in renal hemodynamics and electrolytes excretion. The effect of heat exposure on various other reactions is also summarized the levels of hormones from thyroid gland, the pituitary, and adrenal glands. Keywords: Swamp buffaloes, heat stress, responses of body functions