1. Department of Animal Science, Iowa State University, Ames, IA 50011
2. National Animal Disease Center, Agricultural Research Service-U.S. Department of Agriculture, Ames, IA 50010
3. Department of Dairy Science, South Dakota State University, Brookings, SD 57007
4. Department of Human Food Nutrition, California State University, College of Agriculture, Pomona, CA 91768
5. Stuart Products, Inc., Bedford, TX 76022