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Abstract
1. The effects of tap (TW) or carbonated (CW) water on arterial pH, partial pressure of carbon dioxide (P co2 and plasma lactate were determined in heat‐stressed broilers. Water treatments were infused directly into the crop at a rate of 0.4 ml/min kg BW.
2. Heat stress increased body temperature (Tb) and respiration rate (RR) but both were higher in birds given CW after 4 and 5 h than in TW‐infused controls. However, P CO2 was lower and arterial pH and plasma lactate were higher in TW‐infused birds after 4 and 5 h of heat stress than in CW‐infused birds. Hematocrit was also higher in CW‐treated birds after 4 and 5 h of heat stress than in TW controls.
3. The results indicate that CW is capable of attenuating changes in blood pH and P CO2 in heat‐stressed domestic fowl. The lower pH in CW birds after 4 and 5 h of heat stress may have suppressed plasma lactate concentrations in these birds.