Donley, H. J., C. D. Reinhardt, J. J. Sindt, S. P. Montgomery, and J. S. Drouillard. “Evaluating Relationships Among Blood Glucose, Plasma Urea Nitrogen, Performance, Morbidity, and Mortality in High-Risk Feedlot Heifers”. The Bovine Practitioner, vol. 43, no. 2, June 2009, pp. 122-7, doi:10.21423/bovine-vol43no2p122-127.