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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) In-feed antimicrobial drug use in nADD/100,000 cattle by placement cohort (PC)^a, and antimicrobial class^b, cattle placed 2008–2012. (B) In-feed antimicrobial drug use in grams AMD (gAMD)/100,000 cattle by placement cohort (PC)^a, and antimicrobial class^b, cattle placed 2008–2012.

^aPlacement cohort comprised of cattle placed in the feedlot between 1 November and 31 October of consecutive years. ^bCTC, chlortetracycline; OTC, oxytetracycline; TY, tylosin.