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%. Thus, to make 100 kg of this feed one would mix the following: Rice bran. 27.265 kg.