Table 9.
Medically important antimicrobial regimens per 100 head in for bovine respiratory disease allocated to in-feed (chlortetracycline), control of bovine respiratory disease at processing, and individual animal treatment.
| Use category | Regimens per 100 head in | ||||||
|---|---|---|---|---|---|---|---|
| Year | Study level | Feedyard level | Feedyard count | ||||
| Mean | SD | Median | cv (%) | ||||
| In-feed | 2018 | 4.6 | 13.4 | 10.9 | 9.6 | 81.3 | 5 |
| 2019 | 5.0 | 23.2 | 15.9 | 23.0 | 68.4 | 3 | |
| Control | 2018 | 19.6 | 21.0 | 23.5 | 9.5 | 112 | 14 |
| 2019 | 19.2 | 20.9 | 30.6 | 8.8 | 145.9 | 14 | |
| Individual treatment | 2018 | 12.9 | 13.8 | 9.9 | 11.6 | 71.4 | 14 |
| 2019 | 12.0 | 14.6 | 13.5 | 11.6 | 92.3 | 14 | |
Note the change to Reg/100 head-in from Reg/AY in Table 8.