Studies were carried out to determine the best combination of rice and cooked black beans when one partially replaced the other isonitrogenously. Experiments with young and with adult protein-depleted rats indicate that the best combination was one in which about 60% of the protein of the diet is from rice and 40% from black beans. The range of values was from 70 to 50% rice and from 30 to 50% cooked black beans.
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