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. 2021 Nov 16;12:111. doi: 10.1186/s40104-021-00637-4

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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. 1 — Feed efficiency (G:F) of pigs weaned at different ages (21 and 25 d of age) with increasing average daily whey permeate intake (DWI) from 7 to 11 kg BW. Daily whey permeate intake (g/d) was calculated based on supplemental levels of whey permeate and average daily feed intake. Pigs weaned at 21 and 25 d of age fed a common diet until pigs reach 7 kg BW for 11 and 2 d, respectively. The changes in feed efficiency were: [G:F]_21d = 0.487 + 0.065 log (DWI) (P < 0.05; R² = 0.24; dotted line) and [G:F]_25d = 0.667 + 0.042 log (DWI) (P = 0.061; R² = 0.15; solid line). Therefore, [G:F]_overall = 0.580 + 0.042 log (DWI_21d) + 0.064 log (DWI_25d) (P < 0.05; R² = 0.52). The slope-ratio between different weaning ages was different, indicating that the feed efficiency of pigs weaned at 25 d of age responded greater (P < 0.05) than growth of pigs weaned at 21 d of age as increasing whey permeate intake