Silveira, Paulo Roberto Souza da, Ivo Wentz, and Alfredo Ribeiro de Freitas. “Reproductive Performance of Sows Inseminated Once or Twice Using Semen Stored in Kiew Extender”. Pesquisa Agropecuaria Brasileira 19, no. 7 (April 16, 2014): 909–913. Accessed November 11, 2025. https://apct.sede.embrapa.br/pab/article/view/15972.