Field study of the comparative efficacy of gamithromycin and tulathromycin for the treatment of undifferentiated bovine respiratory disease complex in beef feedlot calves.

Objective: To compare the efficacy of gamithromycin with that of tulathromycin for the treatment of undifferentiated bovine respiratory disease complex (BRDC) in feedlot calves.

Animals: 1,049 weaned crossbred beef calves.

Procedures: At each of 6 feedlots, newly arrived calves with BRDC were administered a single dose of gamithromycin (6.

Field study of the comparative efficacy of gamithromycin and tulathromycin for the control of undifferentiated bovine respiratory disease complex in beef feedlot calves at high risk of developing respiratory tract disease.

Objective: To compare the efficacy of gamithromycin with that of tulathromycin for control of undifferentiated bovine respiratory disease complex (BRDC) in feedlot calves.

Animals: 2,529 weaned crossbred beef calves.

Procedures: At each of 2 feedlots, calves at risk of developing BRDC were administered a single dose of gamithromycin (6.