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. 2021 Jul 6;12:72. doi: 10.1186/s40104-021-00600-3

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© The Author(s) 2021

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 6 — Proposed functions of essential oil in late-phase laying hens. Items with a red up-arrow indicated the increased bacteria, activity of digestive enzyme, villus height to crypt depth ratio or mucosal gene expression in the essential oil-supplemented group compared to the control, whereas those with a green down-arrow indicated the decreased ones in the essential oil-supplemented group