Table 4.

Effects of zinc sulfate and zinc amino acid complex (ZnAA) on serum Zn levels, activities of ALP and CuZn-SOD in weanling pigs¹⁾ (Zn, mg/kg)

Items	ZnSO4	ZnAA					SEM	p-value
	40	0	20	40	80	120		ANOVA	Linear2)	Quadratic
0 d
ALP (U/L)	317.45	369.29	346.71	333.37	297.51	330.20	36.48	0.807	0.342	0.372
Zn (μmol/L)	16.01	17.58	16.08	16.27	15.75	15.03	1.62	0.928	0.325	0.827
CuZn-SOD (U/mL)	41.35	43.89	44.46	44.79	41.35	40.26	4.05	0.948	0.396	0.806
14 d
ALP (U/L)	209.94	185.66	196.73	263.83	260.82	210.06	29.61	0.314	0.440	0.072
Zn (μmol/L)	11.78	10.91	9.76	12.66	14.08	12.96	1.28	0.237	0.058	0.335
CuZn-SOD (U/mL)	54.00ab	45.01a	52.81b	57.70b	62.85b	58.54b	3.39	0.021	0.008	0.027
42 d
ALP (U/L)	185.90ab	143.83a	173.14ab	183.38ab	206.37b	209.16b	15.07	0.050	0.003	0.207
Zn (μmol/L)	11.19b	8.31a	9.63a	11.05b	12.32b	12.13b	0.86	0.022	0.001	0.088
CuZn-SOD (U/mL)	59.86	54.98	60.30	68.31	67.54	60.89	4.47	0.301	0.291	0.025

ALP, alkaline phosphatase; CuZn-SOD, Cu-Zn superoxide dismutase; SEM, standard error of the mean; ANOVA, analysis of variance; ALP, alkaline phosphatase.

¹⁾Data are the means of six replicates of one pig per pen.

²⁾Linear analysis of increasing ZnAA (0 to 120 mg Zn from ZnAA).

^abcMeans within the same column lacking a common superscript letter differ (p<0.05).