1. Institute for Environmentally Integrated Dairy Management, USDA-ARS U.S. Dairy Forage Research Center , Marshfield, WI 54449 , USA
2. Agronomy Department, North Florida Research and Education Center, University of Florida , Marianna, FL 32446 , USA
3. Agronomy Department, Range Cattle Research and Education Center, University of Florida , Ona, FL 33865 , USA
4. Agronomy Department, University of Florida , Gainesville, FL 32611 , USA
5. Department of Animal Sciences, North Florida Research and Education Center, University of Florida , Marianna, FL 32446 , USA
6. Department of Agricultural, Food, and Nutritional Science, University of Alberta , Edmonton, AB , Canada T6G 2R3
7. Department of Animal Sciences, Federal University of Lavras , Lavras, MG 37200 , Brazil