Evaluation of the efficacy of tulathromycin as a metaphylactic antimicrobial in feedlot calves |
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Authors: | Booker Calvin W Abutarbush Sameeh M Schunicht Oliver C Jim G Kee Perrett Tye Wildman Brian K Guichon P Timothy Pittman Tom J Jones Corey Pollock Colleen M |
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Affiliation: | Feelot Health Management Services Ltd., Okotoks, Alberta, Canada. calvinb@feedlothealth.com |
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Abstract: | The purpose of this study was to determine the efficacy and cost-effectiveness of tulathromycin (DRAX) versus tilmicosin (MIC) or oxytetracycline (TET) as a metaphylactic antimicrobial in feedlot calves. Calves that received DRAX had significantly (P<.05) lower initial undifferentiated fever (UF) treatment and relapse rates; lower overall chronicity, overall mortality, and cause-specific mortality rates; higher average daily gains; and improved quality grades. However, calves that received DRAX also had poorer (P<.05) yield grades compared with calves that received MIC or TET and worse feed conversion compared with calves that received MIC. Net advantages in the DRAX group were 3.79CanDollars/animal and 16.96CanDollars/animal compared with the MIC and TET groups, respectively. Based on these results, DRAX is a more efficacious and cost-effective metaphylactic antimicrobial than MIC or TET in feedlot calves at ultra-high risk of developing UF. In addition, this study presents a comparison between two methods ("deads out" and "deads in") of calculating feedlot performance variables. |
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