Table 6.

Effects of different ZnO sources on intestinal microbial populations (Log10 CFU/g) in weanling pigs (d 28)

Item	CL1)	HME1) (ppm)			P-ZnO1)	SEM	Contrasts2) (p-value)
		500	1,000	2,500			CL vs others	HME vs P-ZnO	L	Q
Ileum
Total anaerobic bacteria	7.43	7.47	7.54	7.43	7.63	0.07	0.321	0.087	0.849	0.282
Lactobacillus spp.	8.27	8.45	8.57	8.41	8.53	0.06	0.019	0.536	0.125	0.041
Clostridium spp.	5.59	5.26	5.22	5.3	5.28	0.1	0.015	0.889	0.025	0.019
Coliforms	6.13	5.95	5.89	5.59	5.88	0.06	0.009	0.491	<0.001	0.339
Cecum
Total anaerobic bacteria	8.65	8.58	8.75	8.66	8.83	0.09	0.657	0.212	0.637	0.904
Lactobacillus spp.	8.25	8.32	8.4	8.38	8.45	0.11	0.407	0.609	0.375	0.735
Clostridium spp.	6.73	6.65	6.43	6.32	6.39	0.9	0.062	0.581	<0.001	0.887
Coliforms	6.38	6.3	6.18	6.28	6.11	0.14	0.382	0.481	0.495	0.518
Colon
Total anaerobic bacteria	9.05	9.01	9.22	9.29	9.16	0.11	0.361	0.971	0.051	0.528
Lactobacillus spp.	8.05	8.07	8.14	8.32	8.17	0.12	0.431	0.983	0.152	0.538
Clostridium spp.	7.23	7.18	7.07	7.01	7.06	0.05	0.007	0.584	0.004	0.95
Coliforms	6.89	6.78	6.67	6.69	6.65	0.08	0.028	0.457	0.081	0.465

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.