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. 2019 Feb 21;9:2506. doi: 10.1038/s41598-019-39323-x

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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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Non-metric multidimensional scaling (NMDS) plot based on Bray-Curtis dissimilarity matrix on relative abundance data in broilers (a) and free-range chickens (b). Colors indicate age groups. Ellipses indicate 95% confidence intervals of multivariate t-distribution around centroids of the groupings with age as factor. Dots within the square area in plot b represent chickens with typhlitis, which were excluded for the estimation of the ellipses (see text).