Main effects of dietary carotenoid

Antioxidant parameter	Diet notation
Antioxidant parameter	PO	HP	PR	AS	CA	POL	The control
SOD (U/ml)	59.04 ± 1.23^a	58.13 ± 1.13^a	59.72 ± 0.74^a	61.37 ± 1.18^a	59.52 ± 1.25^a	58.18 ± 0.57^a	66.02 ± 1.18^b
GSH-Px (U/ml)	1033.6 ± 14.2^b	1025.0 ± 21.8^b	1055.1 ± 19.3^b	1065.9 ± 13.7^b	1059.2 ± 7.6^b	931.1 ± 46.6^a	1293.4 ± 10.4^c
T-AOC(U/ml)	12.40 ± 0.43^cd	12.24 ± 0.36^cd	12.69 ± 0.24^d	12.72 ± 0.29^d	11.39 ± 0.69^bc	10.44 ± 0.37^b	9.14 ± 0.32^a
LPO(nmol/ml)	37.06 ± 2.90^c	39.43 ± 1.67^c	36.83 ± 1.47^c	23.21 ± 1.74^b	36.71 ± 2.58^c	15.67 ± 1.04^a	50.57 ± 3.98^d

Note: Data are mean ± SD. Means not bearing the same superscript letters in the same row are significantly different (P<0.05).

Table 4: Main effects of dietary carotenoid concentration on activity of antioxidants in blood parrot after 56 days feeding trial.