Aloízio Soares Ferreira, Gregório Murilo de Oliveira Júnior, Francisco Carlos de Oliveira Silva, Rita Flávia Miranda de Oliveira and Edney Pereira da Silva 2013. Ractopamine for Pigs: A Review about Nutritional Requirements . Journal of Basic & Applied Sciences. 9, (Jan. 2013), 276–285. DOI:https://doi.org/10.6000/1927-5129.2013.09.36.