Ribeiro, E. L. de A., Restle, J. and Pires, C. C. (1991) “Milk production and composition in Charolais and Angus cows nursing straightbred or crossbred calves”, Pesquisa Agropecuaria Brasileira, 26(8), pp. 1267–1273. doi: 10.1590/S1678-3921.pab1991.v26.3464.