Table 5.
Standardized ileal digestibility (%) of crude protein and amino acids in the experimental diets1,3

Item Experimental diets SEM2 P-value
Corn Wheat SBM CM DDGS
Crude protein 84.5a 78.0b 86.3a 76.0b 75.1b 1.0 <0.01
Indispensable amino acids
Arg 90.3a 76.8c 92.2a 85.9b 82.3b 1.0 <0.01
His 88.8a 81.1b 88.7a 83.2b 76.9c 0.7 <0.01
Ile 84.1ab 79.4bc 86.6a 75.7c 75.5c 1.5 <0.01
Leu 91.1a 81.6c 87.1b 80.0c 86.2b 0.9 <0.01
Lys 79.7b 72.9c 90.1a 77.4bc 64.2d 1.5 <0.01
Met 90.8a 82.8c 90.6a 87.8ab 86.1bc 1.2 <0.01
Phe 88.6a 84.5b 88.6a 83.0b 82.8b 1.1 <0.01
Thr 78.7a 71.3b 83.6a 71.2b 69.7b 1.4 <0.01
Val 85.5a 77.8b 85.4a 74.6b 76.1b 1.3 <0.01
Dispensable amino acids
Ala 89.7a 72.4d 86.2b 79.1c 83.6b 1.1 <0.01
Asp 83.6a 71.2bc 84.8a 72.8b 64.9c 1.8 <0.01
Cys 85.0a 80.9ab 78.0b 73.1c 71.6c 1.6 <0.01
Glu 91.1a 91.9a 89.8a 85.7b 82.9b 0.7 <0.01
Gly 79.4ab 74.9c 83.6a 75.5bc 68.0d 1.1 <0.01
Pro 88.4ab 89.4a 85.8b 72.7d 79.7c 1.0 <0.01
Ser 85.0a 79.7b 86.9a 74.0c 76.5bc 1.2 <0.01
Tyr 89.4a 81.2bc 90.1a 79.9c 84.4b 1.0 <0.01
Means in a row different superscripts are significantly different (P<0.05).
SBM, soybean meal; CM, canola meal; DDGS, distillers dried grains with solubles.
SEM, standard error of the means.
Standardized ileal digestibility was calculated using the following basal endogenous losses (mg/kg DM intake): Crude protein, 4,535; Arg, 97; His, 49; Ile, 136; Leu, 258; Lys, 74; Met, 36; Phe, 126; Thr, 324; Val, 157; Ala, 139; Asp, 285; Cys, 121; Glu, 333; Gly, 154; Pro, 237; Ser, 275; Tyr, 91.