1. Range Cattle Research and Education CenterUniv. of Florida Ona FL 33865 USA
2. Clayton Livestock Research CenterNew Mexico State Univ. Clayton NM 88415 USA
3. Agronomy Dep.Univ. of Florida Gainesville FL 32611 USA
4. Dep. of Crop and Soil SciencesNorth Carolina State Univ. Raleigh NC 27695 USA
5. Texas A&M AgriLife Research San Angelo TX 76901 USA
6. Animal Sciences Dep.Univ. Federal de Tocantins Araguaina 77801 Brazil