[1
]São Paulo Agency of Agribusiness Technology (APTA); Andradina SP Brazil
[2
]São Paulo State Univ. (UNESP); College of Agricultural Science, Dep. of Crop Science;
Botucatu SP Brazil
[3
]UNESP, School of Veterinary Medicine and Animal Science; Dep. of Animal Nutrition
and Breeding; Botucatu SP Brazil
[4
]Formerly UNESP; College of Agricultural Science; Botucatu SP Brazil
[5
]Brazilian Agricultural Research Corporation (EMBRAPA); Corn and Sorghum Research Center;
Sete Lagoas MG Brazil
[6
]USDA-ARS; 3218 Williams Hall, Campus Box 7619, North Carolina State Univ. Raleigh
NC 27695-7619