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Table 1. Protein quality rankings.
Protein Protein Biological Net Protein Protein Digestibility
Type Efficiency Value Utilization Corrected Amino Acid
Ratio Score
Beef 2.9 80 73 0.92
Black Beans 0 0 0.75
Casein 2.5 77 76 1.00
Egg 3.9 100 94 1.00
Milk 2.5 91 82 1.00
Peanuts 1.8 0.52
Soy protein 2.2 74 61 1.00
Wheat gluten 0.8 64 67 0.25
Whey protein 3.2 104 92 1.00
Adapted from: U.S Dairy Export Council, Reference Manual for U.S. Whey Products 2nd Edition,
1999 and Sarwar, 1997.