We also found that early age acceleration of growth in the GL birds continued when they were shifted to BL. After switching to BL, there was a further increase in both growth rate and BW. Changing illumination from blue to green at 20 d also enhanced growth compared with
WL- and BL-treated birds. In agreement with our data, broilers (Wabeck and Skoglund, 1974) and quail (Phogatet al., 1985) raised under blue or green fluorescent lamps gained significantly more weight than those reared under red or white fluorescent lamps, but feed conversion and
mortality were not affected.