1. Department of Animal Sciences and Industry, College of Agriculture, Kansas State University, Manhattan, KS 66506-0201, USA
2. Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS 66506-0201, USA
3. Department of Statistics, College of Arts and Sciences, Kansas State University, Manhattan, KS 66506-0201, USA
4. ICM, Colwich, KS 67030-0397, USA