Valero, M. V.; Farias, M. S.; Zawadzki, F.; Prado, R. M.; Fugita, C. A.; Rivaroli, D. C.; Ornaghi, M. G.; do Prado, I. N. Feeding Propolis or Essential Oils (cashew and Castor) to Bulls: Performance, Digestibility, and Blood Cell Counts. Rev. colomb. cienc. pecu. 2016, 29, 33-42.