For example, suppose shrimp meal and corn were also available for the carp feed mentioned above. The crude protein levels of the shrimp meal (52.7 percent) and of corn (10.2 percent) are averaged with soybean meal and rice bran, respectively. Basal feed = 21.35/39.15 = 54.53%. Protein supplement = 17.8/39.15 = 45.47%.