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Table 1 Breakdown of antimicrobial use on 67 Irish farrow-to-finish pig farms during 2016 by route of administration and antimicrobial class. Percentages of active ingredient and TKDDDvet refer to the percentage of overall consumption in terms of weight of active ingredient and number of treatable kilograms, respectively. Percentage of farms with use refers to the percentage of the 67 farms which used each combination of antimicrobial class and route of administration. Total consumption by weight of active ingredient was 14,505 kg; the corresponding number of treatable kilograms (TKDDDvet) was 775,128,079 kg. Mg/PCU in this table refers to consumption for the population of all 67 farms combined

From: Quantification, description and international comparison of antimicrobial use on Irish pig farms

   Overall (%) Medicated feed (%) Water (%) Top dressing (%) Oral dose (%) Injectable (%)
Antimicrobial class mg/PCU AIa TKDDDvetb Farmsc AI TKDDDvet Farms AI TKDDDvet Farms AI TKDDDvet Farms AI TKDDDvet Farms AI TKDDDvet Farms
Tetracyclines 90.38 55.81 34.02 85.07 53.72 32.43 64.18 0.84 0.51 7.46 1.07 0.65 23.88 0.17 0.43 41.79
Potentiated sulphonamides 40.85 25.22 33.86 46.27 25.15 33.74 34.33 0.04 0.05 2.99 0.01 0.01 5.97 0.03 0.07 13.43
Macrolides 15.09 9.32 16.02 65.67 5.99 10.10 37.31 3.28 5.11 13.43 0.04 0.80 34.33
Penicillins 12.69 7.84 10.39 100 3.68 4.57 50.75 2.48 2.73 32.84 0.01 0.01 2.99 1.68 3.09 100
Aminoglycosides 1.40 0.87 1.41 74.63 0.35 0.72 20.90 0.18 0.37 41.79 <0.01 <0.01 1.49 0.34 0.32 47.76
Amphenicols 0.54 0.33 0.62 19.40 0.09 0.17 5.97 0.21 0.39 5.97 0.03 0.06 10.45
Polymyxins 0.29 0.18 0.68 20.90 0.18 0.68 20.90
Aminocyclitols 0.24 0.15 0.67 53.73 0.10 0.53 13.43 0.02 0.12 10.45 0.02 0.01 31.34 0.01 0.01 19.40
Lincosamides 0.22 0.13 0.97 56.72 0.10 0.82 13.43 0.01 0.09 10.45 0.03 0.05 44.78
Fluoroquinolones 0.22 0.13 0.86 85.07 < 0.01 < 0.01 5.97 0.13 0.86 83.58
3rd & 4th gen. Cephalosporins 0.03 0.02 0.49 23.88 0.02 0.49 23.88
Pleuromutilins < 0.01 < 0.01 < 0.01 1.49 <0.01 <0.01 1.49
TOTAL 161.94 100 100 100 89.18 83.09 91.04 7.20 10.01 64.18 1.11 0.70 26.87 0.03 0.02 35.82 2.48 6.18 100
  1. aActive ingredient
  2. bTreatable Kilograms (using the defined daily dose, DDDvet [29])
  3. cFarms with use
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