1. Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine (Cheng, Henao-Díaz, Poonsuk, Piñeyro, Baum, Main, Zimmerman, Giménez-Lirola), Iowa State University, Ames, IA
2. Department of Statistics, College of Liberal Arts and Sciences (Ji, Wang), Iowa State University, Ames, IA
3. Agricultural Research Service, U.S. Department of Agriculture, Ames, IA (Buckley, Van Geelen, Lager)