Evaluation of two methods of in vitro production of ovine embryos using fresh or cryopreserved sémen - Romão, Ricardo; Marques, Carla; Batista, Maria Conceição; Vasques, Maria Irene; Barbas, J Pedro; Horta, António M; Carolino, Nuno; Bettencourt, Elisa Maria Varela; Plancha, Carlos (2012)