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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 antimicrobial drug use in nADD/100,000 cattle by placement cohort (PC)^a, antimicrobial class^b, and specific type of antimicrobial drug^c, cattle placed 2008–2012. (B) Individually dosed antimicrobial drug (AMD) use in grams AMD (gAMD)/100,000 cattle by placement cohort (PC)^a, antimicrobial class^b, and specific type of antimicrobial drug^c, cattle placed 2008–2012. ^aPlacement cohort comprised of cattle placed in the feedlot between 1 November and 31 October of consecutive years. ^bMAC, macrolides; TET, tetracyclines; CEPH, third generation cephalosporins; FQ, fluoroquinolones; PHEN, phenicols (TMS, trimethoprim-sulfamethoxazole; PEN, penicillin; SULF, sulfonamides not depicted due to low usage; ^cTIL, tilmicosin 10 mg/kg; TUL, tulathromycin 2.5 mg/kg; OTHMAC, gamithromycin 6 mg/kg, tildipirosin 4 mg/kg, tylosin 29 mg/head; TET100, oxytetracycline 6.67 mg/kg; TET200, oxytetracycline 20 mg/kg; TET300, oxytetracycline 30 mg/kg; CEF1, ceftiofur hydrochloride or sodium, 1.1 mg/kg; CEF6, ceftiofur crystalline free acid 6.6 mg/kg; DANO, danofloxacin 6 mg/kg; ENRO, enrofloxacin 7.7 mg/kg; FLOR, florfenicol 40 mg/kg.