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. 2015 Sep 30;47:77. doi: 10.1186/s12711-015-0154-0

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© Grams et al. 2015

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Phenotypic trend over 11 generations. The interrupted and continuous lines show the average number of feather pecking bouts per hen during the observation period of 180 min with respective standard errors for the high and low feather pecking line