Ribeiro, Ueliton Fernandes França, et al. “Effect of Virginiamycin on the Performance and Characteristics of Swine Carcass”. Pesquisa Agropecuaria Brasileira, vol. 19, no. 5, Apr. 2014, pp. 651-6, doi:10.1590/S1678-3921.pab1984.v19.15729.