METHODS	Steers were randomly assigned to 1 of 3 treatment groups : ceftiofur at a dosage of 0.1 mg/kg ( 0.045 mg/lb ) of body weight , IM , every 24 hours ; ceftiofur at a dosage of 1.0 mg/kg ( 0.45 mg/lb ) , IM , every 24 hours , and oxytetracycline at a dosage of 6.6 mg/kg ( 3 mg/lb ) , IM , every 24 hours .\