Table 3.

Effects of different ZnO sources on apparent total tract digestibility (%) of nutrients in weanling pigs

Item	CL1)	HME1) (ppm)			P-ZnO1)	SEM	Contrasts2) (p-value)
		500	1,000	2,500			CL vs others	HME vs P-ZnO	L	Q
Phase I (d 14)
Dry matter	82.3	82.5	82.7	82.6	83.4	0.73	0.549	0.449	0.723	0.759
Gross energy	80.1	80.7	81.1	80.7	81.7	0.43	0.096	0.093	0.217	0.222
Crude protein	76.4	76.6	78	77.9	78.2	0.45	0.012	0.161	0.005	0.677
Phase II (d 28)
Dry matter	81	81.1	81.9	81.6	82.5	0.44	0.219	0.147	0.133	0.645
Gross energy	79.8	80.1	80.8	80.9	81.2	0.38	0.044	0.211	<0.001	0.797
Crude protein	75.6	77.4	77.7	78.1	77.2	0.43	0.002	0.347	<0.001	0.063

HME, hot melt extrusion; SEM, standard error of means.

¹⁾CL, basal diet without ZnO; HME, basal diet with 500, 1,000, and 2,500 ppm Zn as HME-ZnO; P-ZnO, basal diet with 2,500 ppm Zn as ZnO.

²⁾Linear (L) and quadratic (Q) effects of HME concentrations.