1. USDA-ARS Livestock Issues Research Unit, Lubbock, Texas, USA,
2. Department of Animal and Food Sciences, Texas Tech University, Lubbock, Texas, USA
3. USDA-ARS, SubTropical Agricultural Research Station, Brooksville, Florida, USA
4. Animal Science Division, University of Missouri-Columbia, Missouri, USA
5. University of Florida-IFAS, Range Cattle Research & Education Center, Ona, Florida, USA