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Published in Crop Sci 14:652-654 (1974)
© 1974 Crop Science Society of America
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Evaluation of the Nutritive Quality of Grain Legumes by an Analysis for Total Sulfur1

W. M. Porter, J. H. Maner, J. D. Axtell and W. F. Keim2

The protein efficiency ratio (PER) was determined for five varieties of dry beans (Phaseolus vulgaris L.), one variety of mung bean [Vigna radiata (L.) Wilczek], and one variety of cowpea [Vigna unguiculata (L.) Walp.], chosen because they showed variability in total sulfur as percent of crude protein and were available in sufficient quantities for rat feeding trials. The correlation of total sulfur as a percent of crude protein with the sum of methionine and cystine as a percent of protein in the seven varieties was highly significant (r = 0.93). Significant correlations of PER on each of the above two variables were obtained, whereas correlations of PER on methionine or cystine alone were not significant. These data indicate the potential for using analysis of total sulfur as a screening technique for nutritive quality in grain legumes.

Key Words: Pulses • Field bean • Phaseolus vulgaris L. • Blackeye pea • Cowpea • Vigna unguiculata (L.) Walp. • Mung bean • Vigna radiata (L.) Wilczek • Protein efficiency ratio • Methionine • Cystine

1 Journal Paper No. 5180, Purdue Agricultural Experiment Station, West Lafayette, IN 47907. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D. The complete cooperation of the Instituto Colombiano Agropecuario, Palmira, Colombia, S. A., the Centro Internacional de Agricultura Tropical, Cali, Colombia, and the Unidad Metabolica, Hospital Departamental, Cali,'Colombia, is acknowledged. The work was supported by the Foreign Area Fellowship Program.

2 Foreign Area Fellow (Present address: International Institute of Tropical Agriculture, P. M. B. 5320, Ibadan, Nigeria); Leader, Swine Production Systems, Centro Internacional de Agricultura Tropical, Cali, Colombia; Associate Professor and Professor, respectively, Purdue University.

Received for publication July 10, 1973.




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