The Thai Journal of Veterinary Medicine


Clearance values of urea, free water, inulin and para-aminohippurate {PAH} were measured in acute heat stressed pigs exposed for 2 h to 36: 27°C (dry wet bulb}. During acute heat exposure, there were no significant changes in plasma osmolarity, inulin clearance and PAH clearance. There were decreases in the rate of urine flow and renal urea clearance. An increase in the relative tubular urea reabsorption by approximately 31% and 106% appeared in the first and the second hour of heat exposure respectively. These changes coincided with an increase in plasma urea concentration and tubular water reabsorption. The elevation of these values did not return to the control level in heat stressed

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