Date of this Version
Two experiments were conducted to evaluate the effects of three intervention strategies on the prevalence of E. coli O157:H7 in feedlot steers. In both experiments, 432 steers were assigned to one of 54 pens. Intervention strategies were two competitive exclusion products, monthly pen cleaning. In Experiment 2 a diet change treatment was imposed prior to slaughter. No differences in performance or carcass yield were observed for the competitive exclusion products or the pen cleaning treatments, compared to the control. However, changing the finishing diet prior to slaughter decreased steer performance. We also observed a nonsignificant decrease in the prevalence of E. coli O157:H7 with inclusion of the competitive exclusion products.