Intake, nutrient digestibility and milk yield of dairy cows fed urea and two levels of crude protein in diets with sugar cane - Jesus, Emerson Ferreira de; Conti, Luis Henrique Andreucci; Tomazi, Tiago; Diniz, Maria Elena; Migliano, Amaral; Silva, Luis Felipe Prada e; Rennó, Francisco Palma; Santos, Marcos Veiga dos (Journal of Animal and Veterinary Advances, 2012)