Two 8-wk broiler trials were conducted during summer growing conditions. Mild heat stress (30 C), as evidenced by panting, was induced by ventilation adjustments. From 4 to 8 wk of age, half of the pens were provided with a .10 strength, human oral rehydration therapy (ORT) solution containing .35 g sodium chloride, .25 g sodium bicarbonate, .15 g potassium chloride, and 4.0 g sucrose/L of drinking water.No significant (P<.05) differences were found between treatments for 8-wk body weight. Mortality rate during the experiment period (4 to 8 wk) did not differ significantly between treatments in either trial, though it approached significance (P = .0558) in Trial 1 where mortality for broilers given ORT was 3.96% compared with 7.67% for control broilers. Feed efficiency was significantly (P<.05) better in Trial 1 for ORT broilers, although no significant difference was found between treatments in Trial 2. Posttrial litter moisture measurements showed no significant differences (P>.05) between treatments in either trial. A crystalline deposit was observed in the internal filters of the bell-type waterers, which was probably caused by the sucrose (sugar) component of the ORT solution.