Table 2. 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 (0–14 d)
ADG (g)	195^b	242^a	239^a	203^ab	8.6	0.026	219^ab	239^a	196^b	7.19	0.028
ADFI (g)	304^b	368^a	362^a	322^ab	9.43	0.011	307	331	274.5	10.4	0.061
FCR	1.56	1.52	1.51	1.60	0.02	0.644	1.40	1.39	1.39	0.02	0.941
Fecal score¹⁾	3.87^a	3.13^b	3.23^b	3.53^ab	0.1	0.016	3.16^b	3.13^b	3.45^a	0.06	0.033
Diarrhea incidence (%)	20.51^a	5.13^b	5.13^b	10.26^ab	0.02	0.009
Phase 2 (15–28 d)
ADG (g)	344	406	392	367	10.59	0.154	293	300	270	9.53	0.442
ADFI (g)	528	562	500	486	16.94	0.442	438	442	400	8.58	0.065
FCR	1.52	1.44	1.43	1.45	0.03	0.721	1.50	1.48	1.51	0.05	0.979
Fecal score¹⁾	3.47	3.0	3.1	3.2	0.07	0.121	4.05	4.08	4.28	0.07	0.379
Diarrhea incidence (%)	20.51^a	2.56^b	5.13^b	7.69^ab	2.56	0.011
Overall (0–28 d)
ADG (g)	270^b	324^a	316^a	285^ab	8.35	0.034	256	270	233	7.85	0.168
ADFI (g)	4.12^b	4.76^a	4.62^ab	4.26^ab	9.49	0.025	373	387	337	9.12	0.056
FCR	1.53	1.47	1.46	1.50	0.01	0.396	1.45	1.435	1.45	0.036	0.961

1 = hard, dry pellets in a small, hard mass; 2 = hard, formed stool that remains firm and soft; 3 = soft, formed and moist stool that retains its shape; 4 = soft, unformed stool that assumes the shape of the container; 5 = watery, liquid stool that can be poured.
Means within a column with different superscripts differ significantly (p < 0.05).
ADG, average daily gain; ADFI, average daily feed intake; FCR, feed conversion ratio.