Figure 1.

The percentage of calves treated at least once, due to health events requiring treatment, with cephalosporin, phenicol, fluoroquinolone, macrolide, penicillin, or tetracycline classes of antibiotics within each age group. Percentages represent the number of calves treated at least once within each antibiotic class over the total number calves in each age group. All 147 calves had antibiotic use data available from hutch (n = 48), weaned (n = 49), and yearling (n = 50) age groups. All calves received prophylactic penicillin and aminoglycoside treatments; weaned and yearling calves received prophylactic tetracycline treatment. Point estimates with 95% confidence intervals are provided in Table S2.