Table 6.

Effect of dietary PQQ·Na₂ supplementation on antioxidant indices in serum of broiler chickens challenged with LPS.

Items	Dietary PQQ·Na2 levels, mg/kg1				SEM	P-values
	1		0
	Saline	LPS	Saline	LPS		LPS	PQQ·Na2	Interaction
Day 20
T-SOD, U/mL	141.62	140.44	145.11	145.59	14.86	0.924	0.389	0.871
CAT, U/mL	7.29	7.21	7.60	7.31	1.10	0.612	0.580	0.768
GSH-Px, U/mL	508.71	515.69	461.76	438.04	80.87	0.766	0.020	0.565
MDA, nmol/mL	4.17	3.77	3.42	3.58	0.85	0.783	0.144	0.358
Day 21
T-SOD, U/mL	171.00	167.03	167.53	171.92	8.21	0.933	0.389	0.871
CAT, U/mL	7.42	7.32	7.73	7.96	1.28	0.939	0.255	0.690
GSH-Px, U/mL	590.57	465.8	476.47	444.53	93.61	0.011	0.046	0.144
MDA, nmol/mL	2.59	2.60	2.60	2.59	0.49	0.997	0.992	0.939
Day 42
T-SOD, U/mL	180.88	178.07	180.88	177.71	8.42	0.248	0.938	0.943
CAT, U/mL	8.27	8.47	8.23	8.24	1.20	0.777	0.694	0.805
GSH-Px, U/mL	651.23	677.36	693.73	663.53	111.86	0.911	0.740	0.440
MDA, nmol/mL	2.58	2.60	2.55	2.56	0.29	0.852	0.726	0.928

P-values for main effect of LPS challenge, the main effect of dietary PQQ·Na₂, and the interaction between the dietary PQQ·Na₂ and LPS challenge.

Abbreviations: CAT, catalase; GSH-Px, glutathione peroxidase; LPS, lipopolysaccharide; MDA malondialdehyde; SEM, pooled standard error of the mean; T-SOD, total super-oxide dismutase.

¹PQQ•Na₂, dietary pyrroloquinoline quinone disodium supplementation; LPS, dietary treatment was injected LPS; saline, dietary treatment was injected saline.