Hawley, J., Powell, J. G., Kegley, E. B., & Beck, P. A. (2016). Comparison of ceftiofur crystalline free acid to tilmicosin for metaphylactic treatment of calves at risk for bovine respiratory disease. The Bovine Practitioner, 50(1), 33–39. https://doi.org/10.21423/bovine-vol50no1p33-39