Bellaver, Cláudio, Paulo Cezar Gomes, Valdomiro Costa, Elias Tadeu Fialho, and Alfredo Ribeiro de Freitas. 2014. “Copper and Virginiamycin As Swine Growth Promotors”. Pesquisa Agropecuaria Brasileira 17 (12): 1789-93. https://doi.org/10.1590/S1678-3921.pab1982.v17.16428.