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. 2019 Apr 16;9:6179. doi: 10.1038/s41598-019-42512-3

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© The Author(s) 2019

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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Affiliative behaviours by housing system across the week. The likelihood of observing affiliative behaviour was lower in the standard system vs. the complex system directly after cage-change and followed a quadratic pattern in both systems across the week. Each dot represents the probability of affiliative behaviour in each cage during an observation session (n = 119 for 12 days × 5 groups × 2 treatments – 1 day of missing data; dots are jittered slightly to avoid overlap); lines and grey shading reflect quadratic fit and 95% confidence interval, respectively.