A comparison of antibiotic resistance in bacteria isolated from swine herds in which antibiotics were used or excluded
نویسنده
چکیده
Methods: Four herds which had been subjected to antibiotic use (AU) and three herds that had not been subjected to antibiotics (AF) were selected. From each herd, six pigs from each of four weight groups (4.5, 23, 45, and 109 kg) and five sows were randomly selected for collection of fecal samples. Non-hemolytic Escherichia coli and potential foodborne pathogens, including Salmonella spp. and E coli O157:H7, were isolated from fecal samples ine, whereas differences were more pronounced in older pigs and sows for oxytetracycline. For salmonella, MICs for oxytetracycline and ceftiofur were greater for AU herds compared to AF herds.
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