Table 5.

The effect of HGT on liver antioxidant function of broilers ¹.

Items	HGT, mg/kg				SEM	p-Value
	0	150	300	450		ANOVA	Linear	Quadratic
T-AOC, U/mg	17.88 b	17.97 b	19.48 b	23.01 a	0.654	0.010	0.002	0.101
SOD, ng/mg	13.68	12.55	13.23	12.35	0.472	0.827	0.591	0.971
GSH-PX, ng/mg	243.7	227.8	252.7	239.2	9.650	0.846	0.835	0.975
GSH, μg/mg	54.31	48.15	51.53	52.82	1.066	0.211	0.907	0.085
CAT, pg/mg	853.4	830.7	821.0	777.5	18.41	0.558	0.178	0.785
MDA, nmol/mg	10.54	9.556	10.16	9.934	0.160	0.171	0.381	0.225
GSH/GSSG	0.960 b	1.066 a	1.061 a	0.986 ab	0.016	0.027	0.261	0.555

¹ Values are means of six replicates per treatment with one bird each. Different superscripts in a row means significant difference (p ≤ 0.05). T-AOC, Total antioxidant capacity; SOD, Superoxide dismutase; GSH-PX, Glutathione peroxidase; GSH, Glutathione; CAT, Catalase; MDA, Malondialdehyde; GSH/GSSG, reduced glutathione/oxidized glutathione disulfide; SEM, standard error of the mean.