Artificial lighting is one of the most powerful managementtools available to commercial layer producers. Artificial light allowsanticipating or delaying the beginning of lay, improving egg production,and optimizing feed efficiency. This study aimed at comparing theperformance of commercial layers submitted to lighting using differentLED colors or conventional incandescent lamps. The study was carriedout in a layer house divided in isolated environments in order to preventany influenced from the neighboring treatments. In total, 360 Isa Brownlayers, with an initial age of 56 weeks, were used. The following lightsources were used: blue LED, yellow LED, green LED, red LED, white LED,and 40W incandescent light. Birds in all treatment were submitted toa 17-h continuous lighting program, and were fed a corn and soybeanmeal-based diet. A completely randomized experimental design withsubplots was applied, with 24 treatments (six light sources and fourperiods) of three replicates. Egg production (%) was significantlydifferent (p<0.05) among treatments, with the best results obtainedwith red LED, white LED, and incandescent light sources. Egg weight,feed intake, and internal egg quality (albumen height, specific gravity,and Haugh units) were not influenced (p>0.05) by light source. It wasconcluded that the replacement of incandescent light bulbs by whiteand red LEDs does not cause any negative effect on the egg productionof commercial layers
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