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. 2018 Feb 7;8:2533. doi: 10.1038/s41598-018-20652-2

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Experimental design for monitoring the individual voluntary locomotor activity of the focus animals. At five different ontogenetic time points the pigs were observed via video camera for 48 h each. The daily distances of each focus pig were analysed using the VideoMotionTracker® according to Brendle and Hoy⁸ and summed over the time points. All focus animals were assigned to the distance categories of short, medium or long distances (n = 4, each).