Antimicrobial resistance of gram-negative enteric bacteria from pigs in a nonantimicrobial-exposed herd before and after transportation

Loading pigs onto trucks and transporting them for 30 min resulted in a sig nificant increase in proportion of antimicrobial resistance of gram-negativ e enteric bacteria in fecal material. Similarly, the mean number of antimic robial agents in the resistance patterns of these bacteria increased during loading and transportation. However, the increases were of a transient nat ure, as resistance values were similar to those of a nontransported control group 1 day after the pigs had been transported.