1. US Dairy Forage Research Center, USDA-Agricultural Research Service, Madison, Wisconsin, USA
2. Department of Bacteriology, University of Wisconsin, Madison, Wisconsin, USA
3. School of Agronomy, Universidade Federal de Goiás (UFG), Goiânia, Goiás, Brazil
4. Institut de l’élevage, Beaucouse, France
5. Animal Genomics and Improvement Laboratory, USDA-Agricultural Research Service, Beltsville, Maryland, USA