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. 2020 Mar 10;11:19. doi: 10.1186/s40104-020-0427-5

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© The Author(s). 2020

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 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.

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Fig. 1 — Effects of in ovo feeding of L-arginine on intestinal morphological structure of layer chicks. A, D and G were the duodenum on d 3, 14 and 42 respectively; B, E and H were the jejunum on d 3, 14 and 42 respectively; C, F and I were the ileum on d 3, 14 and 42 respectively. ^a-bValues at the same index with no common superscripts differ significantly (n = 8; P < 0.05). NC, non-injected control group; SC, saline-injected control group; Arg6, injected with 6 mg Arg; Arg10, injected with 10 mg Arg