1Received for publication July 16, 1979. Contribution from Agricultural Research, Science and Education Administration, USDA, and the Departments of Crop and Soil Science and Food Science and Human Nutrition; Michigan State University, East Lansing, MI 48824. Research supported by the College of Agriculture and Natural Resources, Michigan State University and published with approval of the Michigan Agricultural Experiment Station as paper no. 8966. Mention of a trade name, proprietary product, or specific equipment does not constitute a guarantee or warranty by the U.S. Department of Agriculture and does not imply its approval to the exclusion of other products that may be suitable.
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2Research Geneticist, SEA-AR, USDA; and Assistant Professor of Food Science and Human Nutrition, Michigan State University.
3The authors thank Dr. J. R. Wagner, Research Leader, AR, SEA, USDA, WRRC, Albany, CA 94710 for performing Kjeldahl determinations on the experimental material and for other nutrient and chemical analysis.