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. 2020 Jun 26;10(6):1106. doi: 10.3390/ani10061106

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Percentage of hens with skin injuries on at least one body region (n = 200 hens/lighting group and week) during production period depending on light spectrum (UV-A light +/−). The UVincl group (blue bars) contained significantly more hens with severe injuries compared to the experimental group with standard lighting (UVexcl group; grey bars). * Significant differences in the percentage of hens with skin injuries (score 1 or higher) on at least one body region (p < 0.05; WL: 27, 28, 29, 32, 33, 34, 35, 36, 37, 38, 41, 45, 46, 47, 48).