Table 2. Comparison of the effects of zinc oxide and zinc aspartic acid chelate on growth performance in weaning pigs

Items	CON	TRT1	TRT2	SEM	p-value
Body weight (g)
Day 1	7.02	7.01	7.00	0.16	0.999
Day 21	14.08	13.69	13.72	0.17	0.624
Day 42	23.54b	24.5a	24.77a	0.22	0.042
ADG (g)
Days 1-21	336	318	320	5.32	0.321
Days 22–42	450b	517a	526a	12.44	0.006
Days 1–42	393	417	423	5.97	0.084
ADFI (g)
Days 1–21	395	374	374	6.72	0.357
Days 22–42	614b	685a	703a	15.29	0.021
Days 1–42	516	529	538	5.68	0.308
Feed efficiency
Days 1–21	0.85	0.85	0.85	0.004	0.935
Days 22–42	0.73	0.75	0.74	0.005	0.267
Days 1–42	0.76	0.78	0.78	0.005	0.125

CON, basal diet; TRT1, basal diet + 3,000 ppm ZnO; TRT2, basal diet + 750 ppm Zn-Asp.
Means in the equivalent row show the superscripts differ (p < 0.05).
ADG, average daily gain; ADFI, average daily feed intake.