Table 6.   Effect of flaxseed cake levels on the blood serum antioxidants indices of laying hens.

Flaxseed cake, %	GPX, U/mL	TAC, mmol/L	Vitamin E, μg/mL	MDA, μmol/mL	MDA/TAC
0	34.4	0.823	0.650	1.46	0.562
5	35.4	0.819	0.615	1.47	0.557
10	34.9	0.821	0.627	1.49	0.559
RMSE	1.032	0.0038	0.030	0.0059	0.0041
P-value	0.275	0.270	0.157	0.265	0.184

GPX, glutathione peroxidase; TAC, total antioxidant capacity; MDA, malondialdehyde; MDA/TAC, malondialdehyde:total antioxidant capacity ratio; RMSE= root mean square error.