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. 2023 Mar 27;10:1056362. doi: 10.3389/fvets.2023.1056362

Table 5.

Medically important Reg/AY and mg/kg-LW by antimicrobial class at the study level with feedyard count, expressed as values.

Use category Antimicrobial class Reg/AY mg/kg-LW # Feedyards
2018 2019 2018 2019 2018 2019
in-feed Macrolide 2.02 1.86 20.90 21.29 16 15
Tetracycline 0.12 0.10 4.42 4.04 9 6
Total in-feed 2.14 1.96 25.32 25.33
Control of BRD Cephalosporin 0.11 0.07 0.19 0.10 7 7
Fluoroquinolone 0.0001 0.001 0.0003 0.003 1 2
Macrolide 0.15 0.18 0.12 0.14 12 15
Penicillin 0.02 0.01 0.08 0.04 3 3
Phenicol 0.0004 0.00 0.006 0.00 2 0
Sulfonamide* 0.0007 <0.0000 0.037 0.002 1 1
Tetracycline 0.05 0.09 0.29 0.56 6 8
Total control 0.34 0.35 0.73 0.84
Individual animal treatment Aminoglycoside 0.00 0.00 0.02 0.02 1 1
Cephalosporin 0.02 0.03 0.04 0.04 17 18
Fluoroquinolone 0.05 0.05 0.12 0.12 17 16
Macrolide 0.09 0.07 0.08 0.07 20 20
Penicillin 0.004 0.01 0.03 0.05 5 6
Phenicol 0.05 0.06 0.50 0.58 19 19
Sulfonamide 0.01 0.01 0.82 1.14 8 6
Tetracycline 0.04 0.03 0.23 0.20 16 17
Total Individual 0.26 0.26 1.84 2.23
All uses Overall total 2.74 2.56 27.89 28.40

Decimal places were increased up to 4 places to display a non-zero value where possible. *Six regimens were reported for sulfonamides for control of BRD in 2019.