1. Dep. of Population Health and Reproduction; School of Veterinary Medicine, Univ. of California; Davis CA 95616
2. Dep. of Animal Science; Univ. of California; Davis CA 95616
3. Dep. of Animal Science; Iowa State Univ.; Ames IA 50011
4. USDA-ARS, Northwest Irrigation and Soils Research Laboratory; Kimberly ID 83341