1. Department of Animal Sciences, Federal University of Lavras, Campus Universitário, s/n, 37200-000 Lavras, MG, Brazil.
2. Department of Animal Sciences, University of Illinois, 1207 West Gregory Drive, Urbana, IL 61801, USA.
3. Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, Bevier Hall, Urbana, IL 61801, USA.
4. Agricultural Sciences Institute, Federal University of Minas Gerais, Campus Regional de Montes Claros, Avenida Universitária 1.000, 39404-547 Montes Claros, MG, Brazil.