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. 2021 Mar 12;8:601394. doi: 10.3389/fvets.2021.601394

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Copyright © 2021 Lourenco, Hampton, Johnson, Callaway, Rothrock and Azain.

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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Feed efficiency (expressed as gain: feed ratio) for piglets in the No Antibiotic and Antibiotic groups observed over the course of the entire study. Feed efficiency was significantly improved in the Antibiotic, compared to the No Antibiotic group (0.7075 vs. 0.6564; P = 0.04; which is equivalent to 1.41 and 1.52 kg feed:1 kg body weight gain, respectively). No antibiotic was given in the phase 3 of the study.