1. Department
of Animal Sciences, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
2. Division
of Nutritional Sciences, Cornell University, Ithaca, New York 14850, United States
3. Biological
Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
4. Animal
Nutrition Division, Archer Daniels Midland Co., Quincy, Illinois 62301, United States