1. Departamento de Zootecnia, Universidade Federal de Goiás, Goiânia, Goiás 74690–900, Brazil
2. Agrocria Ind. & Com. LTDA, Goiânia, Goiás 74513-050, Brazil
3. Department of Animal Science and Industry, Kansas State University, Manhattan, KS 66506, USA
4. Department of Animal and Range Sciences, New Mexico State University, Clayton Livestock Research Center, Clayton, NM 88415, USA