Effect of different nonprotein nitrogen sources on performance and carcass characteristics of feedlot finished Nellore steers - Corte, Rosana Rüegger Pereira da Silva; Nogueira Filho, José Carlos Machado; Brito, F. O.; Leme, Paulo Roberto; Pereira, Angélica Simone Cravo; Aferri, Gabriela; Silva, Saulo da Luz e (Annual Meeting of the European Federation of Animal Science, 2009)