Table 1.

Mean values for performance parameters of piglets^a

Parameterb	Valuec			Pooled SEMd	Pe
	LZn	MZn	HZn
BW (kg)
−4 dpi	7.0	7.4	7.4	0.18	0.503
0 dpi	7.1	8.2	8.1	0.17	0.109
2 dpi	7.4	8.4	8.0	0.18	0.139
7 dpi	8.2	9.1	9.7	0.26	0.065
14 dpi	9.3a	11.3b	11.7b	0.35	0.010
21 dpi	12.1	13.6	13.3	0.36	0.237
28 dpi	15.3	16.2	15.9	0.47	0.748
35 dpi	19.6	20.3	20.5	0.59	0.808
42 dpi	24.0	25.2	25.7	0.74	0.649
AG (kg)
2–7 dpi	1.58a	1.27a	3.42b	0.255	0.000
7–14 dpi	2.23a	4.43b	3.92b	0.321	0.005
14–21 dpi	5.68a	4.55ab	3.32b	0.323	0.004
21–28 dpi	6.33	5.17	4.72	0.315	0.089
28–35 dpi	8.58	8.33	8.43	0.271	0.938
35–42 dpi	8.90	9.83	9.53	0.416	0.673

^aPiglets were weaned at the age of 28 days, fed a diet low in Zn (LZn) or supplemented with 150 mg Zn/kg (MZn) or 2,500 mg Zn/kg (HZn) as ZnO, and infected with Salmonella Typhimurium on day 32.

^bBW, body weight, based on individual data; AG, average gain within a pen (2 pigs/pen) over the period given.

^cValues followed by different superscript letters differ significantly (P < 0.05) by the Tukey test.

^dThe pooled SEM corresponds to the overall value for LZn, MZn, and HZn.

^eP values of multivariate analysis of variance (MANOVA) performed to test the effects of the three levels of zinc in the diet with significance level of P < 0.05 (bold).