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. 2022 Jan 3;22:1. doi: 10.1186/s12866-021-02409-6

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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. 2 — Contrasts of feeding behavior traits among breeds during three periods. Data are presented as least squares mean with the confidence interval. Different letters a, b, and c denote P < 0.05 between breeds within each time point. Colors represent three breeds: Duroc (DR), Landrace (LR), and Large White (LW). The x-axis represents three periods: P1, P2, and P3. To avoid the overlaps, dots representing three breeds are depicted horizontally away from each other for each period. (A) AOTD = average daily feeder occupation time (s); (B) ADFR = average daily feeding rate (g/min); (C) ANVD = average daily number of visits to feeder; (D) AFIV = average amount of feed consumed per visit (g); (E) AOTV = average feeder occupation time per visit (s); (F) AFRV = average feeding rate per visit (g/min)