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. 2019 Oct 17;6:329. doi: 10.3389/fvets.2019.00329

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Copyright © 2019 Brault, Hannon, Gow, Warr, Withell, Song, Williams, Otto, Booker and Morley.

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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(A) Individually dosed and in-feed antimicrobial drug use (AMU) in number of animal daily doses (nADD)/100,000 cattle in placement cohort^a (PC), cattle placed 2008–2012. (B) Individually dosed and in-feed antimicrobial drug use in total grams of antimicrobial drug (gAMD)/100,000 cattle in placement cohort^a (PC), cattle placed 2008–2012. ^aPlacement cohort comprised of cattle placed in the feedlot between 1 November and 31 October of consecutive years.