Table 4. Effect of dietary zinc oxide of concentrations and sources on nutrient digestibility in weaning piglets (%)

Item	Experiment 1						Experiment 2
	Control	In2500	N500	N150	SEM	p-value	In2500	N300	N150	SEM	p-value
Phase 1 (d 14)
DM	80.5	82.02	81.78	81.05	0.3	0.291	80.46	80.79	80.07	0.23	0.469
CP	77.84	80.47	79.25	78.76	0.41	0.119	78.23	78.41	77.63	0.26	0.468
EE	72.21	73.27	73.04	72.61	0.19	0.697
GE	82.85	83.39	83.42	82.97	0.2	0.288	82.91	83.07	82.7	0.29	0.896
Phase 2 (d 28)
DM	78.18	80.35	80.25	79.19	0.37	0.108	79.57	79.29	79.05	0.27	0.771
CP	75.56b	78.90a	78.63a	76.94ab	0.52	0.042	77.2	77.69	76.58	0.29	0.324
EE	71.6	72.13	71.93	71.91	0.16	0.759
GE	80.91	81.88	81.97	81.16	0.34	0.678	82.07	82.13	81.3	0.36	0.626

Means within a column with different superscripts differ significantly (p < 0.05).
DM, dry matter; CP, crude protein; EE, ether extract; GE, gross energy.