Factor | Platt2008 (10088)

10.2460/ajvr.69.8.988

Chlortetracycline Use

Cattle | Finishers

3

Description

Steers administered chlortetracycline (22 mg/kg) in feed in 3 separate 5-day periods (1 day of no AMU between each period). Factor =avg of all sampling timepoints (days -7, 0, 2, 6, 8, 12, 14, 19, 22, 26, 33). Both groups had other AMU in feed.

Resistance Outcomes

Resistance Microbe Outcome
Tetracycline
/
Escherichia coli
See: Pg. 991 para. 3, totals from pg. 991 para. 2 AMR+ (%) AMR- (%) Total (n)
Chlortetracycline Use 68.80 213
No Chlortetracycline Use 42.30 184
Ceftiofur
/
Escherichia coli
See: Pg. 992, para. 1, totals from pg. 991 para. 2 AMR+ (%) AMR- (%) Total (n)
Chlortetracycline Use 2.90 213
No Chlortetracycline Use 8.60 184
Tetracycline
/
Enterococcus spp.
See: Pg. 993 para. 1, totals from pg. 992 para. 2 (170/0.909 and 160/0.894) AMR+ (%) AMR- (%) Total (n)
Chlortetracycline Use 53.30 179
No Chlortetracycline Use 12.30 187