Table 2.
Distribution of antimicrobial drug use [% (no.)] of individual calves as documented in farm records and displayed by calf housing type and order of treatment after birth
| Description | IP1
|
GP2
|
||||
|---|---|---|---|---|---|---|
| First treatment | Second treatment | Third treatment | First treatment | Second treatment | Third treatment | |
| Any drug3 | 38 (63) | 18 (31) | 9 (14) | 16 (55) | 6 (19) | 1 (3) |
| Distribution of antimicrobial drug use by treatment order: | ||||||
| β-Lactam, | 79 (50) | 35 (11) | 7 (1) | 12 (7) | ||
| Penicillin G | 17 (11) | 6 (2) | ||||
| Ampicillin | 12 (7) | |||||
| Ceftiofur | 62 (39) | 29 (9) | 7 (1) | |||
| Fluoroquinolones | 3 (2) | 6 (2) | 21 (3) | 49 (27) | 47 (9) | 66 (2) |
| Enrofloxacin | 3 (2) | 6 (2) | 21 (3) | 49 (27) | 47 (9) | 66 (2) |
| Macrolides | 11 (7) | 58 (18) | 43 (6) | 23 (13) | 53 (10) | |
| Tulathromycin | 11 (7) | 55 (17) | 36 (5) | 23 (13) | 53 (10) | |
| Tylosin | 3 (1) | 7 (1) | ||||
| Phenicols | 9 (6) | 44 (1) | ||||
| Florfenicol | 9 (6) | 44 (1) | ||||
| Tetracyclines | 2 (1) | |||||
| Oxytetracycline | 2 (1) | |||||
| Sulfonamide | 30 (4) | |||||
| Sulfamethazine | 30 (4) | |||||
| Median age at treatment, d (range) | 9 (0–57) | 12 (6–46) | 19 (7–46) | 20 (3–37) | 29 (15–49) | 37 (32–43) |
1
Calves housed in individual pens, fed milk or milk replacer (n = 164).
2
Calves housed in group pens, fed acidified milk ad libitum (n = 315).
3
Percent and number of calves receiving any antimicrobial drug treatment.