1. Grazing Ecology Research Group Federal University of Rio Grande do Sul ‐ Porto Alegre Rio Grande do Sul Brazil
2. Department of Agricultural Diagnosis and Research Secretary of Agriculture, Livestock and Rural Development ‐ Porto Alegre Rio Grande do Sul Brazil
3. Department of Plant Sciences University of California ‐ Davis Davis California USA
4. Programa Pasturas y Forrajes Instituto Nacional de Investigación Agropecuaria (INIA) ‐ Treinta y Tres Treinta y Tres Uruguay