Department of Chemistry, Federal University of Lavras, P.O. Box 3037, 37200-000, Lavras, MG, Brazil (C.A.N., E.C.R., I.R.G., M.C.G.); and Department of Zootechnics, Federal University of Espírito Santo, P.O. Box 16, 29500-000, Alegre, ES, Brazil (A.S.A.) (At 2011-06)