Table 2.

Effects of dietary IA supplementation on growth performance of broiler chickens.

Item	Added IA, %						SEM	P-value
	0	0.2	0.4	0.6	0.8	1.0		A	L	Q
BW day 1 (g)	43.0	42.5	43.0	42.5	42.5	43.0	0.07	0.252	0.708	0.407
BW d 21 (g)	859.2	872.5	874.2	872.5	855.0	845.0	4.68	0.386	0.200	0.074
BW d 42 (g)	2,487.4	2,490.2	2,563.9	2,544.4	2,501.4	2,472.3	15.02	0.462	0.844	0.064
Starter (1–21 d)
ADG (g)	38.9	39.5	39.6	39.5	38.7	38.2	0.22	0.379	0.202	0.070
ADFI (g)	56.7	56.6	56.6	56.6	56.3	55.9	0.23	0.918	0.302	0.601
F/G (g/g)	1.46	1.43	1.43	1.43	1.45	1.46	0.01	0.667	0.638	0.118
Grower (22–42 d)
ADG (g)	77.5	77.6	80.9	79.3	78.4	77.5	0.67	0.676	0.963	0.174
ADFI (g)	162.9abc	161.7bc	164.6abc	168.1a	166.6ab	159.2c	0.83	0.013	0.983	0.005
F/G (g/g)	2.11	2.09	2.04	2.12	2.13	2.06	0.02	0.739	0.980	0.959
Whole period (1–42 d)
ADG (g)	58.2	58.6	60.2	59.4	58.5	57.8	0.35	0.425	0.718	0.061
ADFI (g)	109.8abc	109.2bc	110.6ab	112.3a	111.4ab	107.5c	0.45	0.022	0.736	0.007
F/G (g/g)	1.89	1.87	1.84	1.89	1.90	1.86	0.01	0.736	0.896	0.800

Broiler chickens receiving a basal diet (0) or diets supplemented with 0.2, 0.4% 0.6, 0.8, or 1.0% IA; A, P value of one-way ANOVA; L, P value of linear analysis; Q, P value of quadratic analysis.

Abbreviations: ADG, average daily gain; ADFI, average daily feed intake; BW, body weight; F/G, feed/gain ratio.

^a,b,cMean values within a row with different superscript letters were significantly different (P < 0.05).