Costa, Valdomiro, et al. “Protein and Energy Levels in Creep Feed Rations for Suckling Pigs”. Pesquisa Agropecuaria Brasileira, vol. 18, no. 10, Apr. 2014, pp. 1155-61, https://doi.org/10.1590/S1678-3921.pab1983.v18.15453.