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Bovine respiratory disease (BRD), also known as "shipping fever," is the most common - and costly - disease of feedlot cattle. Leading university animal scientists to nominate their most recent, cutting-edge BRD research below.
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Ear Vs. Neck
Ear injection of a clostridial bacterium toxoid vaccine (Alpha-7) does not appear to influence ADG or rate of growth promotant implant payout, say Kansas State University researchers.
In a 129-day study, 200 previously non-implanted heifers were given one of four treatments: vaccine in left neck and implant in left ear, vaccine in left neck and implant in right ear, vaccine in right ear and implant in left ear, vaccine in right ear and implant in right ear.
Vaccinating in the base of the ear vs. vaccinating in the neck significantly increased ear temperature, but 28-day gains were similar. Weight gains for opposite and same ear placement of vaccine and implant were similar. Regardless of vaccination site, testosterone concentrations in the blood were similar for heifers implanted in the right ear.
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