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. 2021 Apr 23;8:660400. doi: 10.3389/fvets.2021.660400

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Copyright © 2021 Rieke, Spindler, Zylka, Kemper and Giersberg.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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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) Severe feather pecking, (B) gentle feather pecking. *Between bars denotes an effect of hybrid (P < 0.05). *After “Period” denotes an effect of period (P < 0.05). Both for severe feather pecking and gentle feather pecking a hybrid × period interaction was found (P < 0.05).