Figure 3. Relative gain in body mass (%, relative to the original body mass) in chickens reared under different polychromatic light spectra.

Body mass was measured at 45, 60, 72 and 81 days of age, and the percent gain in body mass (relative to the original body mass) was calculated. Data are expressed as the mean ± SEM (n = 20). Bars marked with different letters are significantly different from each other (P<0.05).