1. University of Idaho, Department of Animal, Veterinary, and Food Sciences, Moscow, ID 83844, USA
2. USDA, Agricultural Research Service, U.S. Sheep Experiment Station, Dubois, ID 83423, USA
3. University of Idaho, Department of Animal, Veterinary, and Food Sciences, Idaho Agricultural Experiment Station, Nancy M. Cummings Research, Extension, and Education Center, Carmen, ID 83462, USA