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. 2021 Jan 11;12:10. doi: 10.1186/s40104-020-00522-6

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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. 3 — Models developed from literature to determine the response of dietary lactose level on predicted daily feed intake (ADFI, g/d), average daily gain (ADG, g/d) and G:F (ADG: ADFI) of weanling pigs. Meta-analysis was performed using GLM procedure of SAS 9.4. The linear and quadratic equations of ADFI, ADG and G:F were predicted, and only the quadratic equations are presented. a the ADFI, ADG or G:F responses of d 0–7 post-wean piglets in relation to dietary lactose level were predicted by using 12 studies (n = 38); b the ADFI, ADG or G:F responses of d 7–14 post-wean piglets to dietary lactose level were predicted by using 10 studies (n = 40); c the ADFI, ADG or G:F responses of d 14–35 post-wean piglets to dietary lactose level were predicted by using 9 studies (n = 54)