| prevalence and patterns of antimicrobial resistance of fecal escherichia coil among pigs on 47 farrow-to-finish farms with different in-feed medication policies in ontario and british columbia. | the main objectives of this study were to determine the prevalence and patterns of antimicrobial resistance in pigs on farms that medicated swine ration and those that did not. a total of 940 isolates of escherichia coli from 188 pooled fecal samples obtained from weaner and finisher pigs on 47 farrow-to-finish swine farms (34 farms used in-feed medication and 13 did not) were tested for susceptibility to 21 antimicrobials using a breakpoint concentration method. the prevalence of resistance var ... | 2008 | 18505210 |