Table 9.

Effects of dietary manganese (Mn) level on serum biochemical and antioxidant indices of duck breeders at the end of the trial (34 wk).

Variables2	Mn supplemental level (mg/kg)1						SEM	P-value
	0	20	40	80	120	160		ANOVA	Linear	Quadratic
TP (g/L)	59.4	63.7	55.2	57.9	57.7	54.5	0.93	0.049	0.045	0.139
ALB (g/L)	20.4	19.6	19.4	19.5	19.5	19.4	0.29	0.941	0.448	0.626
UA (μmol/L)	251	240	255	201	229	266	8.2	0.238	0.965	0.136
CRE (μmol/L)	3.95	3.76	3.79	3.81	4.15	3.48	0.187	0.959	0.760	0.881
TB (μmol/L)	19.8	21.9	11.6	16.3	12.2	12.6	0.84	<0.001	0.001	0.001
GLU (mmol/L)	11.6	12.0	9.93	10.8	10.4	10.8	0.19	0.003	0.053	0.021
TG (mmol/L)	10.2	11.3	5.32	6.30	7.73	6.77	0.481	<0.001	0.016	0.005
TC (mmol/L)	2.51	2.94	1.89	2.15	2.20	1.91	0.088	0.001	0.009	0.027
HDL-C (mmol/L)	1.40	1.40	1.17	1.17	1.25	1.25	0.037	0.221	0.177	0.088
LDL-C (mmol/L)	0.50	0.51	0.33	0.38	0.35	0.41	0.018	0.003	0.036	0.005
Ca (mmol/mL)	5.37	5.73	5.04	5.27	5.03	4.95	0.073	0.011	0.008	0.030
P (mmol/mL)	3.00	4.08	3.30	2.98	3.14	3.43	0.114	0.040	0.655	0.765
T-AOC (U/mL)	5.76	5.50	7.36	6.95	10.0	8.83	0.344	<0.001	<0.001	<0.001
T-SOD (U/mL)	46.5	52.9	58.5	69.6	78.2	79.3	2.210	<0.001	<0.001	<0.001
Mn-SOD (U/mL)	5.45	17.7	19.7	26.1	28.5	38.1	1.84	<0.001	<0.001	<0.001
MDA (nmol/mL)	10.0	10.0	8.90	8.71	7.85	6.37	0.282	<0.001	<0.001	<0.001

¹Mean of 6 replicates (2 duck samples per replicate) per treatment.

²TP: total protein; ALB: albumin; UA: uric acid; CRE: creatinine; TB: total bilirubin; GLU: glucose; TG: triglycerides; TC: total cholesterol; HDL-C: high-density lipoprotein cholesterol; LDL-C: low-density lipoprotein cholesterol; Ca: calcium; P: phosphorus; T-AOC: total antioxidant capacity; T-SOD: total superoxide dismutase; Mn-SOD: Mn-containing superoxide dismutase; MDA: malondialdehyde.