Abstract
Two overhead, low-pressure sprinkling systems were tested for their efficacy of cooling broiler chickens in two houses (treatment) during two summer flocks, and compared to the evaporative cooling systems in two other houses (control) on a commercial broiler farm. The bird live weight, feed conversion, livability were not significantly different between the treatment houses and the control houses. The sprinkler houses had substantially higher air temperature but lower relative humidity than that in the control houses during day time in the test periods. Litter moisture conditions at the end of grow-outs were not significantly different. Cooling water in treatment houses averaged about 1/3 of those used in control houses during first summer flock, and averaged about 1/10 of those of control houses during second summer flock. Electricity for ventilation in treatment houses were higher than that in control houses during second summer flock, due to the relatively cooler ambient temperature during the second test period and tunnel fans in control houses operated slightly less than those in treatment houses.
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