Orchitis in roosters with reduced fertility associated with avian infectious bronchitis virus and avian metapneumovirus infections - Villarreal Buitrago, Laura Yaneth; Brandão, Paulo Eduardo; Chacón, Jorge Luis; Assayag, M. S; Maiorka, Paulo César; Raffi, P; Saidenberg, A. B. S; Jones, R. C; Ferreira, Antonio José Piantino (Avian Diseases, 2007)