Table 8. Standardized ileal digestibility (%) of amino acids in the corn- or soybean meal-based diet fed to 10-d-old and 22-d-old broiler chickens¹⁾

Item	Corn		SBM		SEM	p-values
	d 10	d 22	d 10	d 22		Age	Ingredient	Age × Ingredient
Indispensable AA
Arg	85.7	91.3	89.8	93.4	0.55	< 0.01	< 0.01	0.082
His	81.3	89.5	85.6	89.8	0.80	< 0.01	0.008	0.018
Ile	81.1	88.6	86.3	90.1	0.86	< 0.01	< 0.01	0.038
Leu	85.1	92.8	86.5	90.2	0.63	< 0.01	0.362	< 0.01
Lys	75.1	81.8	86.5	89.5	0.98	< 0.01	< 0.01	0.060
Met	86.0	91.1	89.3	93.5	0.60	< 0.01	< 0.01	0.438
Phe	81.6	90.7	86.0	90.1	0.73	< 0.01	0.017	< 0.01
Thr	71.8	82.7	81.4	86.8	1.39	< 0.01	< 0.01	0.056
Val	80.8	85.3	85.8	87.2	1.01	0.006	< 0.01	0.140
Dispensable AA
Ala	82.1	91.1	84.6	89.0	0.79	< 0.01	0.816	0.007
Asp	77.8	85.5	80.6	85.8	1.00	< 0.01	< 0.01	0.215
Cys	77.2	85.8	70.5	81.9	1.18	< 0.01	< 0.01	0.239
Glu	85.9	92.8	87.5	91.1	0.60	< 0.01	0.922	0.011
Gly	72.1	80.7	78.8	84.3	1.15	< 0.01	< 0.01	0.191
Pro	81.8	89.0	84.0	88.5	0.78	< 0.01	0.271	0.087
Ser	78.5	86.2	82.7	88.7	1.06	< 0.01	< 0.01	0.425
Tyr	83.1	87.8	86.9	90.8	0.82	< 0.01	< 0.01	0.637

Data are least squares means of eight observations per treatment.
AA, amino acids; Arg, arginine; His, histidine; Ile, isoleucine; Leu, leucine; Lys, lysine; Met, methionine; Phe, phenylalanine; Thr, threonine; Val, valine; Ala, alanine; Asp, aspartic acid; Cys, cysteine; Glu, glutamic acid; Gly, glycine; Pro, proline; Ser, serine; Tyr, tyrosine.