The effect of vaccines and antimicrobials on the formation of injection site lesions in subprimals of experimentally injected beef calves

Two hundred and thirty-nine beef calves were used to determine the occurren ce of injection site lesions at slaughter (16 to 17 mo of age) following th e use of 3 different 8-way clostridial bacterins, a 4-way viral respiratory vaccine, various long-acting oxytetracycline preparations, florfenicol, ce ftiofur, and trimethoprim-sulfa when injected in the top hip (top butt), th igh (round), or neck (blade) of calves at 2 to 3 or 5 to 7 mo of age. The o ccurrence of lesions varied by product, route of administration, and locati on of injection. The number of steaks affected with lesions, the trim weigh t of lesions, the histological class of lesions, and the economic losses fr om trim are described.