Table 5.

Effects of dietary marine-derived polysaccharides (MDP) on antioxidant capacity of liver and jejunum in late-phase laying hens after 6 wk feeding trial.

Items1	Dietary MDP levels (mg/kg)				SEM2	P-value
	0	1,000	2,500	5,000		Linear	Quadratic
Liver
T-SOD, U/mg prot	284.30	266.77	277.94	320.80	33.00	0.445	0.396
GSH-Px, U/mg prot	4.89	9.64	8.12	18.47	5.81	0.181	0.646
CAT, U/mg prot	6.05a	14.98b	14.97b	12.55a,b	1.89	0.061	0.024
MDA, nmol/mg prot	0.74a	0.38b	0.40a,b	0.43a,b	0.09	0.082	0.088
Jejunum
T-SOD, U/mg prot	318.03a	415.48b	410.88b	404.44a,b	25.36	0.066	0.087
GSH-Px, U/mg prot	103.84	108.93	91.93	93.09	19.62	0.595	0.924
CAT, U/mg prot	2.67	4.42	5.65	4.95	0.52	0.014	0.058
MDA, nmol/mg prot	0.46a	0.25b	0.24b	0.26b	0.05	0.026	0.054

^a,bMeans in the same row with different letters are significantly different at P < 0.05.

¹T-SOD, total superoxide dismutase; GSH-Px, glutathione peroxidase; CAT, catalase; MDA, malondialdehyde.

²SEM, standard error of mean.