Table 8.
Number and percentage of cattle (placed 2008–2012) exposed to antimicrobial drugs in-feed, individually dosed, and associated with hormone implants.
| Type of antimicrobial exposureb | ||||
|---|---|---|---|---|
| All cattle | In feed | Individually dosed | With implant | |
| OVERALL, NO. (% OF TOTAL CATTLE) | ||||
| 2,615,082 (100) | 2,527,316 (97) | 1,910,825 (73) | 544,790 (21) | |
| AGE AT ARRIVAL, NO. (% OF TOTAL CATTLE, % OF CALVES OR YEARLINGS) | ||||
| Calf | 1,180,499 (45) | 1,151,277 (44, 97) | 1,060,838 (41, 90) | 254,633 (10, 22) |
| Yearling | 1,434,583 (55) | 1,376,039 (53, 96) | 849,987 (33, 59) | 290,157 (11, 20) |
| SEX, NO. (% OF TOTAL CATTLE, % OF SPECIFIC ROUTE OF EXPOSURE) | ||||
| Male | 1,643,528 (63) | 1,607,049 (61, 98) | 1,291,246 (49, 79) | 327,661 (13, 20) |
| Female | 971,554 (37) | 920,267 (35, 95) | 619,579 (24, 64) | 217,129 (8, 22) |
| SEASON OF ARRIVAL, NO. (% OF TOTAL CATTLE, % OF SPECIFIC ROUTE OF EXPOSURE) | ||||
| Cold | 1,616,686 (62) | 1,565,713 (60, 97) | 1,314,050 (50, 81) | 357,547 (14, 22) |
| Warm | 998,396 (38) | 961,603 (37, 96) | 596,775 (23, 60) | 187,243 (7, 19) |
| BRDa RISK CATEGORY, NO. (% OF TOTAL CATTLE, % OF SPECIFIC ROUTE OF EXPOSURE) | ||||
| High | 1,021,639 (39) | 1,005,810 (38, 98) | 971,146 (37, 95) | 248,377 (9, 24) |
| Low | 1,593,443 (61) | 1,521,506 (58, 95) | 939,679 (36, 59) | 296,413 (11, 19) |
The number of exposed cattle is presented in the left part of the cell.
For the overall number, the percentage of overall cattle this number represents is presented in the right part of the cell in parentheses. When cattle are stratified by particular characteristics and type of antimicrobial exposure, first the percentage of total cattle is presented in parentheses, followed by the percentage of cattle with that characteristic. Percentages of use may not add to 100% due to rounding.
a
Bovine Respiratory Disease.
b
Individual cattle may be exposed to antimicrobial drugs via more than one route.