1. Graduate research assistant and associate professor, respectively, Departments of Biological Systems Engineering and Food Science and Technology, University of Nebraska-Lincoln, Lincoln, NE 68583-0726.
2. Currently, graduate research assistant, Department of Food Science and Nutrition, University of Minnesota, St. Paul, MN 55108.
3. Corresponding author. E-mail: bsen004@unlvm.unl.edu
4. Professor and Head, Department of Biometry, University of Nebraska-Lincoln, Lincoln, NE 68583-0712.