The main effects of light sources and light intensity
on growth performance in comparison with ICD bulbs
of broilers grown to heavy weights are presented in
Table 1. In comparison with ICD bulbs, there was only
an effect of Cool-PSF-LED on BW on d 42 (P = 0.049)
and d 56 (P = 0.047) during the study period. Similarly,
there was only an effect of Cool-PSF-LED on
BWG on d 42 (P = 0.046) and d 56 (P = 0.048) in
comparison with ICD bulbs. However, there was no difference
among the 3 new light source bulbs examined in
this study. In addition, there was no difference among
ICD, CFL, and Neutral-LED light bulbs on BW and
BWG in the present study. There was no effect of light
intensity and no difference between 20 lx and 5 lx on
growth performance. Also, there was no light intensity
× light sources effect on BW and BWG, respectively.
Moreover, there was no treatment effect on cumulative
FI and cumulative FCR data during the study period
(d one to d 56) as presented in Table 1. The influence
of light sources and light intensity on preprocessing live
weight, carcass characteristics, fat, and yields of broilers
at 56 d of age are presented in Table 2. The Cool-
PSF-LED bulbs had higher (P = 0.011) live weight in
comparison with ICD bulbs but there was no difference
among the new light source (CFL, Neutral-LED, Cool-
PSF-LED) bulbs examined. Also, there was no difference
among ICD, CFL, and Neutral-LED bulbs on live
weight in the present study. Furthermore, Cool-PSFLED
bulbs had higher (P = 0.045) carcass weight in
comparison with ICD bulbs. There was no difference
among new light source bulbs examined and no difference
among ICD, CFL, and Neutral-LED bulbs on
carcass weight in the present study. There was no effect
of light intensity and light intensity × light sources
on live weight and carcass weight, respectively. Also,
there was no effect of light sources on carcass yield. In
addition, there was no effect of light sources, light intensity,
and their interaction on fat weight, fillet weight,
tender weight, and yields in the present study as presented
in Table 2. The main effects of light sources and
light intensity on selected welfare indices are presented
in Table 3. As shown in the table, all examined welfare
indices (eyes to BW ratio, humoral immune response,
ocular assessments, ocular histopathologic examination,
TI, GS) were not different statistically by treatments
on any of the sampling d. The data obtained for