Gasperin, Bernardo Garziera, Gabriel Fernando Freling, Rogério Ferreira, João Francisco Coelho de Oliveira, Vilceu Bordignon, and Paulo Bayard Dias Gonçalves. 2011. “Intravaginal Progestagen for Estrus and Parturition Control in Sows”. Pesquisa Agropecuaria Brasileira 46 (8):961-64. https://doi.org/10.1590/S1678-3921.pab2011.v46.10294.