Received for publication 6 Aug. 1983. Joint contribution from the Agricultural Research Service. U.S. Dept. of Agriculture and Departments of Crop and Soil Sciences and Food Science and Human Nutrition, Michigan State University. East Lansing, MI 48824. Approved for publication by the Michigan Agr. Exp. Stn. as Journal Article No. 10921. Mention of a trade name, proprietary product or specific equipment does not constitute a guarantee or warranty by the USDA and does not imply its approval to the exclusion of other products that may be suitable. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.
Research Geneticist, Agricultural Research Service, USDA.
Associate Professor of Food Science and Human Nutrition.