1USDA, ARS, U.S. Meat Animal Research Center, Clay Center, NE, USA
2USDA, ARS, U.S. Dairy Forage Research Center, Madison, WI, USA
3Great Plains Veterinary Educational Center, University of Nebraska-Lincoln, Lincoln, NE, USA
4Department of Biomolecular Engineering, University of California, Santa Cruz, CA, USA
5American Simmental Association, Bozeman, MT, USA
6Simmentals of Texas, Granbury, TX, USA
7Stroud Veterinary Embryo Services, Weatherford, TX, USA
8College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, USA
9USDA, ARS, National Animal Germplasm Program, Fort Collins, CO, USA
10Gluck Equine Research Center, University of Kentucky, Lexington, KY, USA
11Department of Animal, Veterinary, and Food Science, University of Idaho, Moscow, ID, USA
12Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA, USA
13Howard Hughes Medical Institute, University of California Santa Cruz, Santa Cruz, CA, USA
14USDA, ARS, Animal Genomics and Improvement Laboratory, Beltsville, MD, USA
✉Address correspondence to M. P. Heaton at the address above, or e-mail: mike.heaton@usda.gov and B. D. Rosen at the address above, or e-mail: ben.rosen@usda.gov.