Abstract
A study was conducted to determine the intensity of light required at night during the summer months for maximum growth rate of broilers reared in curtain-sided houses. Light intensity for 14 of the 24 h was 431 lx, simulating daylight hours, and either 9, 30, or 69 lx for 10 of the 24 h, simulating night hours. The temperature regimen used was a 24-h linear temperature cycle of 24 to 35 to 24 C. Results showed that light intensity at night did not significantly influence 6-wk body weights or feed conversion ratios of broiler males. Twenty-five watt rather than 75 to 100 W incandescent bulbs are sufficient for maximum growth rate for most curtain-sided broiler houses, with two strings of light bulbs that are 2.1 m high and on 3-m centers equidistant from the ends and sidewalls.
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