Holzback, T. L., Corassa, A., Kiefer, C., Teixeira, A. O., Moreira, L. M., & Junior, C. M. R. (2018). A step-up ractopamine feeding program for finishing pigs. Revista Colombiana De Ciencias Pecuarias, 31(4), 276–284. https://doi.org/10.17533/udea.rccp.v31n4a04