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Pecking behavior in conventional layer (LB+) and dual-purpose (LD) hybrids at three times during the laying period (1: 25th−30th, 2: 43rd−48th, 3: 64th−69th week of life). (A) Aggressive pecking, (B) environmental pecking. *Between bars denotes an effect of hybrid (P < 0.05). *After “Period” denotes an effect of period (P < 0.05). Both for aggressive pecking and environmental pecking a hybrid × period interaction was found (P < 0.05).
