Table 2.
Antimicrobial treatment protocols adopted at WEANING/INDUCTION at each cow–calf operation.
| Operationa | Feedb | Parenteralb | ||
|---|---|---|---|---|
| Antimicrobial | Dosage | Antimicrobial | Dosage | |
| 1 | –c | – | – | – |
| 2 | Chlortetracycline | 1 g/100 lbsd | Gamithromycin | 6 mg/kg |
| 3 | – | – | Tulathromycin | 2.5 mg/kg |
| 5 | – | – | – | – |
| 7 | Chlortetracycline | 1 g/100 lbsd | Tulathromycin | 2.5 mg/kg |
| 9 | – | – | – | – |
| 11 | – | – | – | – |
| 12 | Chlortetracycline | 1 g/100 lbsd | Tulathromycin | 2.5 mg/kg |
| 13 | – | – | Tilmicosin | 10 mg/kg |
| 15 | – | – | Oxytetracycline | 20 mg/kg |
| 16 | Chlortetracycline | 1 g/100 lbsd | Tilmicosine | 10 mg/kge |
| 17 | – | – | – | – |
| 18 | Chlortetracycline | 1 g/100 lbsd | ||
| 19 | – | – | Tulathromycin | 2.5 mg/kg |
| 20 | Chlortetracycline | 1 g/100 lbsd | Oxytetracycline | 20 mg/kg |
| 21 | Chlortetracycline | 1 g/100 lbsd | – | – |
| 22 | Chlortetracycline | 1 g/100 lbsd | – | – |
a
Five operations with no antimicrobial use data were excluded.
b
Protocols listed are those adopted in most calves from each operation.
c
A dash (–) indicates that antimicrobials were not used at WEANING/INDUCTION by that route of administration.
d
Body weight, daily for 15 days.
e
Protocol administered to 15 calves. Another 14 calves were treated with tulathromycin (2.5 mg/kg).