Table 3.

Efficacy of dietary α-amylase supplementation on nutrient digestibility in different intestinal sites of the broiler chicken.¹

Intestinal site	α-amylase, KNU/kg			SEM	Linear	Quadratic
	0	80	160
Anterior jejunum
DMD, %	42.6	43.3	36.8	2.12	0.077	0.188
DE, %	32.3	30.1	26.2	2.14	0.063	0.769
DE, kcal/g	1.417	1.307	1.175	0.095	0.093	0.923
N, %	49.8	47.4	49.0	1.92	0.781	0.413
Starch, %	71.1	69.6	66.0	1.71	0.053	0.629
Posterior jejunum
DMD, %	60.7	60.0	56.6	0.87	0.005	0.227
DE, %	54.8	62.6	61.1	1.06	0.001	0.003
DE, kcal/g	2.403	2.724	2.736	0.047	<0.001	0.017
N, %	68.7	65.3	66.3	1.24	0.189	0.177
Starch, %	79.9	85.0	83.3	0.90	0.018	0.008
Anterior ileum
DMD, %	69.8	74.1	74.9	0.49	0.639	0.035
DE, %	69.6	74.1	74.9	0.50	<0.001	0.009
DE, kcal/g	3.048	3.221	3.354	0.022	<0.001	0.477
N, %	76.8	76.9	76.5	0.74	0.757	0.816
Starch, %	92.8	95.8	95.7	0.25	<0.001	<0.001
Posterior ileum
DMD, %	74.5	73.5	72.3	0.39	0.001	0.861
DE, %	72.9	76.0	76.3	0.38	<0.001	0.008
DE, kcal/g	3.194	3.306	3.417	0.017	<0.001	0.977
N, %	81.7	79.4	80.3	0.67	0.189	0.077
Starch, %	97.1	97.8	98.9	0.24	<0.001	0.420
Total tract
DMD, %	74.4	73.8	73.5	1.17	0.586	0.910
AME, %	75.9	76.7	77.0	1.02	0.460	0.877
AME, kcal/g	3.328	3.335	3.452	0.045	0.072	0.335
N, %	72.9	73.1	73.9	0.17	0.568	0.829
AMEn, %	70.6	71.5	71.7	0.94	0.428	0.781
AMEn, kcal/g	3.095	3.109	3.213	0.041	0.063	0.388
Starch, %	98.1	98.7	98.7	0.17	0.038	0.147

Abbreviations: AME, apparent metabolizable energy; DE, digestibility energy; DMD, DM digestibility.

¹Data are least square means of 8 replicate cages per diet.