Table 7.

Effects of different ZnO sources on small intestinal morphology of weanling pigs (d 28)

Item1)	CL1)	HME1) (ppm)			P-ZnO1)	SEM	Contrasts (p-value)2)
		500	1,000	2,500			CL vs others	HME vs P-ZnO	L	Q
Duodenum
Villus height (μm)	423	447	445	445	454	5.01	<0.001	0.186	0.01	0.029
Crypt depth (μm)	253	247	239	241	243	6.28	0.139	0.913	0.131	0.424
VH/CD	1.68	1.78	1.87	1.85	1.88	0.07	0.008	0.635	0.021	0.112
Jejunum
Villus height (μm)	394	402	412	405	417	4.86	0.051	0.176	0.156	0.235
Crypt depth (μm)	242	234	224	216	223	8.32	0.067	0.869	0.038	0.964
VH/CD	1.63	1.72	1.85	1.87	1.87	0.06	0.011	0.448	0.011	0.696
Ileum
Villus height (μm)	228	230	241	259	245	7.88	0.047	0.804	0.006	0.307
Crypt depth (μm)	153	145	140	149	141	7.18	0.251	0.669	0.654	0.268
VH/CD	1.49	1.63	1.77	1.73	1.74	0.11	0.089	0.847	0.144	0.471

HME, hot melt extrusion; SEM, standard error of means; VH/CD, villus height to crypt depth ratio.

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.