This is the author manuscript accepted for publication and has undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record . Please cite this article as doi: 10.1111/EVJ.12709 This article is protected by copyright. All rights reserved 1 DR. LAURA HARDEFELDT (Orcid ID : 0000-0001-5780-7567) 2 3 4 Article type : General Article 5 6 7 Editorial ref. code: EVJ-GA-17-054.R1 8 9 10 Antimicrobials used for surgical prophylaxis by equine veterinary practitioners in 11 Australia 12 13 L. Y. Hardefeldt* a,b , G. F. Browning a,b , K. Thursky b , J. R. Gilkerson a , H. Billman-Jacobe a,b , 14 M. A. Stevenson a and K. E. Bailey a,b 15 a Asia-Pacific Centre for Animal Health, Faculty of Veterinary and Agricultural Sciences, 16 University of Melbourne, Parkville, Victoria, Australia; 17 b 20 National Centre for Antimicrobial Stewardship, Peter Doherty Institute, Grattan Street, 18 Carlton, Victoria, Australia 19 *Corresponding author email: laura.hardefeldt@unimelb.edu.au 21 22 23 Keywords: horse; antimicrobial; stewardship; resistance; surgery 24 Summary 25 Background: Antimicrobials are widely used in Australian veterinary practices, but no 26 investigation into the classes of antimicrobials used or the appropriateness of use in horses 27 has been conducted. 28 Objectives: The aim of the study was to describe antimicrobial use for surgical prophylaxis 29 in equine practice in Australia. 30 Study design: Cross-sectional questionnaire survey. 31 Author Manuscript