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Antimicrobial Resistance in Bovine Respiratory Disease: Auction Market- and Ranch-raised Calves

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Journal Can Vet J
Date 2022 Jan 3
PMID 34975167
Citations 5
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Abstract

This study compared changes in prevalence and antimicrobial susceptibility of , and in feedlot calves derived from the auction market (AUCT; = 299) and from a single-ranch source (RANCH; = 300). In the AUCT calves, the prevalence of decreased, whereas increased over the feeding period. The AUCT calves showed an increase in isolates not susceptible to tulathromycin for all bovine respiratory disease (BRD) pathogens, an increase in and isolates not susceptible to oxytetracycline, and an increase in isolates not susceptible to florfenicol. In the RANCH calves, the prevalence of all 3 BRD pathogens was high at feedlot entry and decreased significantly during the study period. In RANCH calves, there was a significant increase in isolates not susceptible to oxytetracycline, tulathromycin, and florfenicol. Surprisingly, there was a significant decrease in isolates that were not susceptible to oxytetracycline, tilmicosin, and tulathromycin.

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