Organic and inorganic sources of zinc, copper and selenium in diets for dairy cows: intake, blood metabolic profile, milk yield and composition - Cortinhas, Cristina Simões; Freitas Júnior, José Esler de; Naves, Julianne de Rezende; Porcionato, Marco Aurélio de Felicio; Silva, Luis Felipe Prada e; Rennó, Francisco Palma; Santos, Marcos Veiga dos (Revista Brasileira de Zootecnia, 2012)