Table 6.

Effects of dietary IA supplementation on serum biochemical parameters of broiler chickens

Item	Added IA, %						SEM	P-value
	0	0.2	0.4	0.6	0.8	1.0		A	L	Q
Starter (1–21 d)
SOD (pg/ml)	32.5c	34.1c	33.7c	35.9b	38.0a	37.5ab	0.40	<0.01	<0.001	0.920
ALT (ng/L)	102.6c	106.6bc	109.9b	120.4a	109.8b	109.4b	1.14	<0.01	0.001	<0.01
AST (ng/L)	126.0b	127.3b	127.7b	128.2b	130.0ab	134.7a	0.81	0.023	0.001	0.172
CAT (ng/L)	57.6c	57.9c	61.7a	61.1ab	58.3c	59.1bc	0.38	0.001	0.197	0.001
T-AOC (U/ml)	5.9	5.7	5.8	6.0	5.8	5.6	0.08	0.765	0.403	0.522
Grower (22–42 d)
SOD (pg/ml)	32.6	32.5	35.9	36.2	35.6	33.5	0.57	0.193	0.209	0.045
ALT (ng/L)	107.7	108.4	114.7	114.7	116.2	122.9	1.86	0.173	0.010	0.787
AST (ng/L)	135.6	139.5	139.9	140.6	140.6	140.6	2.00	0.982	0.512	0.666
CAT (ng/L)	55.1	58.4	60.0	55.0	55.8	55.6	0.76	0.289	0.519	0.217
T-AOC (U/mL)	5.5b	5.9ab	6.0a	6.2a	6.3a	6.4a	0.09	0.021	0.001	0.287

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

Abbreviations: ALT, alanine aminotransferase; AST, aspartate aminotransferase; CAT, catalase; SOD, superoxide dismutase; T-AOC, total antioxidation capacity.

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