| prevalence of escherichia coli o157:h7 and performance by beef feedlot cattle given lactobacillus direct-fed microbials. | fecal shedding of escherichia coli o157:h7, the prevalence of escherichia coli o157:h7 in pens and on carcasses and hides, and cattle performance as a result of daily dietary supplementation with lactobacillus-based direct-fed microbials (dfms) were evaluated in a feeding trial involving 180 beef steers. steers were evaluated for shedding of e. coli o157:h7 by an immunomagnetic separation technique on arrival at the feedlot, just before treatment with the dfms, and every 14 days thereafter until ... | 2003 | 12747680 |