1. Department of Animal and Range Sciences, Montana State University, Bozeman, MT
2. Department of Animal Science, University of Wyoming, Laramie, WY
3. USDA, ARS, Range Sheep Production Efficiency Research Unit, U.S. Sheep Experiment Station, Dubois, ID
4. USDA, ARS, Genetics, Breeding, and Animal Health Research Unit, Roman. L. Hruska U.S. Meat Animal Research Center, Clay Center, NE