Emrich, E. S.; Durães, M. C.; Vilela, H.; Pereira, C. S. The Use of Urea and Blood Meal in Rations for Crossbred Heifers (Red and White Holstein X Guzera). PAB 2014, 9 (3), 1-6. https://doi.org/10.1590/S1678-3921.pab1974.v9.17153.