Table 3.
Medically important regimens by antimicrobial class within use category (2018 and 2019 combined).
| Use category | Antimicrobial class | Number of feedyards | Total regimens all years | Percent of total regimens | Percent of total regimens by use category |
|---|---|---|---|---|---|
| In-feed | Macrolide | 16 | 1,128,515 | 72.76 | 77.76 |
| Tetracycline | 9 | 77,574 | 5.00 | ||
| Control of bovine respiratory disease | Cephalosporin | 8 | 51,777 | 3.34 | 12.67 |
| Fluoroquinolone | 2 | 429 | 0.03 | ||
| Macrolide | 16 | 96,132 | 6.20 | ||
| Penicillin | 4 | 6,639 | 0.43 | ||
| Phenicol | 2 | 124 | 0.01 | ||
| Sulfonamide | 1 | 195 | 0.01 | ||
| Tetracycline | 10 | 41,305 | 2.66 | ||
| Individual animal treatment | Aminoglycoside | 1 | 1,714 | 0.11 | 9.57 |
| Cephalosporin | 18 | 14,355 | 0.93 | ||
| Fluoroquinolone | 17 | 27,934 | 1.80 | ||
| Macrolide | 20 | 46,654 | 3.01 | ||
| Penicillin | 6 | 3,146 | 0.20 | ||
| Phenicol | 19 | 30,725 | 1.98 | ||
| Sulfonamide | 8 | 4,269 | 0.28 | ||
| Tetracycline | 17 | 19,616 | 1.26 | ||
| Total | 1,551,104 | 100.00 | 100 |