Abstract
nd week till the end of the trial, the live weights of the animals included in the 24L:0D and self-photoperiod groups were higher than those included in the 16L:8D group (P 0.05). No difference was detected between the groups for mortality rates or carcass percentages (P>0.05). The heterophil/lymphocyte ratios (H/L) were similar in the self-photoperiod and 16L:8D groups and were lower than those of the 24L:0D group. In conclusion; when the broilers allowed to regulate their own photoperiod, they had similar body weights but lower stress level than those kept under commercial lighting system.
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