Antimicrobial resistance in bovine respiratory disease

Auction market and ranch raised calves

Authors

  • Trent R. Wennekamp Large Animal Clinical Sciences, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5B4, Canada
  • John R. Campbell Large Animal Clinical Sciences, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5B4, Canada
  • Cheryl L. Waldner Large Animal Clinical Sciences, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5B4, Canada
  • Kathy Larson Large Animal Clinical Sciences, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5B4, Canada
  • Claire Windeyer Department of Production Animal Health, University of Calgary, Calgary, Alberta, T2N 1N4, Canada
  • Anatoliy Trokhymchuk Prairie Diagnostic Services Inc., University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5B4, Canada

DOI:

https://doi.org/10.21423/aabppro20197208

Keywords:

Antimicrobial drugs, bovine respiratory disease complex, mixing of cattle, antimicrobial sensitivity

Abstract

Antimicrobials are important tools in modern beef production. Antimicrobial drugs are often used for metaphylaxis to prevent and treat early cases of bovine respiratory disease complex (BRD) as well as for therapeutic purposes in feedlot cattle. Antimicrobial resistance of bovine respiratory pathogens can result in treatment failures and losses associated with increased treatment costs and mortalities.

Mixing of cattle from multiple sources within auction markets has always been a significant risk factor for BRD. The stress of establishing a social dominance hierarchy along with the mixing of pathogens from a variety of farm sources can increase the risk of BRD in weaned calves. One method feedlots have used to mitigate this risk is to reduce mixing stress by purchasing calves directly from the ranch rather than through the auction market.

The objective of this study was to describe the prevalence and antimicrobial sensitivity of 3 major bovine respiratory disease (BRD) bacterial pathogens at arrival and again later in the feeding period in feedlot calves derived from the auction market and from a single ranch source.

Cover image of the 52nd Conference Proceedings: A photo of a herd of cattle shot from below. A black and white cow is looking curiously at the phototgrapher. Yellow

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Published

2019-09-12

Issue

2019

Section

Research Summaries