Hoshi, E., Fonseca, N., Pinheiro, J., Marçal, W. and Silva, C. 2005. Effects of the use of ractopamine in pregnant sows on reproductive and blood parameters. Spanish Journal of Agricultural Research. 3, 2 (Jun. 2005), 213-219. DOI:https://doi.org/10.5424/sjar/2005032-141.