Table 3. Effect of dietary zinc oxide of concentrations and sources on growth performance in weaning piglets

Item	Experiment 1						Experiment 2
Item	Control	In2500	N500	N150	SEM	p-value	In2500	N300	N150	SEM	p-value
Phase 1 (d 14)
Lactobacillus spp.	9.29	9.47	9.58	9.33	0.08	0.616	9.58	9.62	9.65	0.05	0.836
Coliforms	8.72^a	8.34^b	8.32^b	8.65^ab	0.06	0.015	8.67^ab	8.54^b	8.79^a	0.06	0.023
Clostridium spp.	8.71^a	8.26^b	8.37^b	8.54^ab	0.06	0.008	8.56^ab	8.41^b	8.80^a	0.06	0.023
Phase 2 (d 28)
Lactobacillus spp.	9.64	9.56	9.62	9.58	0.07	0.986	9.53	9.68	9.75	0,05	0.169
Coliforms	8.57	8.48	8.45	8.54	0.03	0.433	8.59	8.47	8.66	0.07	0.623
Clostridium spp.	8.76^a	8.55^b	8.60^ab	8.65^a	0.03	0.015	8.67^ab	8.47^b	8.74^a	0.04	0.013

Means within a column with different superscripts differ significantly (p < 0.05).