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. 2020 Jan 23;11:32. doi: 10.3389/fmicb.2020.00032

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Copyright © 2020 Quan, Wu, Ye, Peng, Wu, Ruan, Qiu, Ding, Wang, Zheng, Cai, Huang and Yang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Overview of the experimental design. Feed efficiency (FE) was defined as the weight gained between weaning and 140 days of age, divided by total feed intake.