SR9095 - Antimicrobial Resistance in Selected Bacteria of Beef Cattle and Associations with On-Farm Antimicrobial UseThe Ministry funded this project through the New
Directions Research Program in 2001.
Lead researcherDr. Scott McEwen, Dept. of Population Medicine, University of Guelph Objectives
Expected benefits
ResultsAccurate quantities of antimicrobials were necessary for understanding
antimicrobial resistance patterns in generic fecal Escherichia coli
collected from the same farms. For this project, antimicrobial use
was documented descriptively at the farm level (to indicate the number
of farms using the various antimicrobial products), and more quantitatively
the mass (kg) of active ingredient for the various antimicrobial products
was determined, and evaluated for the various farm operation types as
measures of different consumption patterns for the main stages of beef
cattle production. Further evaluation into rates of antimicrobial usage
taking into consideration farm herd sizes and length of time in the study
are underway. Key findings were that on all farm types, the predominant
injectable antimicrobial used was oxytetracycline, whereas fluoroquinolone
and cephalosporin use were minimal. Penicillin was commonly used at greater
than the labeled dose on all farm types. Related informationFor more information: Toll Free: 1-888-466-2372 ext. 64554 Local: (519) 826-4554 E-mail: research.omafra@ontario.ca
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