Nitrogen balance and milk composition of dairy cows fed with urea and soybean meal and two protein levels using sugar cane based diets - Conti, Luís Henrique Andreucci; Ferreira de Jesus, Elmeson; Pereira, Angélica Simone Cravo; Arcari, Marcos André; Peixoto Junior, Kleber da Cunha; Rennó, Francisco Palma; Santos, Marcos Veiga dos (Brazilian Journal of Veterinary Research and Animal Science, 2014)