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The antimicrobial use m veterinary medtcine is of concern because of possible transmisston of resistant bactena to humans. However the relation between use and occurrence of resistance ts poorly documented m the field. Sixteen farrow-to-fimsh herds were selected and classified on the frequency of antimicrobial administrations (low (LU), medium (MU) and high (HU) users). lndtcative Eschenchia coli strains were tsolated from faeces of sows (5 per herd) and young pigs (3 per sow) at several ttmes during animals' hfe and tested for reststance to amoxictllin , gentamtctn, tnmethoprim-sulfamids and tetracyclin . The percentages of resistant strams were compared between herd groups. The frequency of reststant strams was higher during the lactating and post-weanmg penods for sows and young pigs respective ly. The level of antimicrobial use was assoctated wtth the percentage of reststance although variattons were observed depending on antimicrobials. Tetracyclin reststance was very frequent: from 63 to 93.2% tn sows and from 65.8 to 99% in young pigs. Similar kmetic although lower frequencies were obtatned with trimethoprim-sulfamids from 37.4 to 74% in sows and from 32.7 to 84.6% in pigs. On the other hand amoxicillin resistance was lower and highly variable depending on the sampling time: from 15.5 to 59% in sows and from 7 to 70 3% in pigs. Lowest frequency values were observed for gentamicin with up to 19.3 and 25 3% tn sows and ptgs respectively. Although we demonstrated that low antimicrobial use is associated wtth less frequent reststance tn faeca l E coli, both antimtcrobtal family and admmistratton scheme have to be taken mto account when considenng the innuence of treatments.

Effect of antimicrobial use on the resistance of Escherichia coli in faecal flora of pigs