Abstract
The broiler industry is seeking effective and economical methods to minimize production heat losses. Poultry exposedto heat stress pant and experience reduced blood carbon dioxide concentration, suggesting that supplementing birdswith carbon dioxide would be beneficial. Chilled drinking water also has a potential to reduce heat stress. The present studiesseek to determine the effectiveness of offering carbonated or reducedtemperature water to two broiler flocks raised to 42 daysof age. Bird production performance data obtained from the two studies were combined since environmental temperaturesduring both studies were mild with little heat stress activity, except for a sudden increase in environmental temperatures on day38 in the second study. There were no significant differences in live weight, cumulative mortality, and feedtogain ratio atharvest when data obtained from the two studies were combined. Birds provided chilled drinking water showed a 1.2 L/birdgreater cumulative drinking water use than those provided tap water at ambient temperature. Ambient air temperatures werebetween 29. C and 37.C during the hottest periods in either study. Reducedtemperature carbonated drinking water had betterretention of dissolved carbon dioxide, as indicated by significantly lower pH (p < 0.001, at . = 0.050) when compared withambienttemperature carbonated drinking water.
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