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 (January):276-85. https://doi.org/10.6000/1927-5129.2013.09.36.