Table 2. Effect of different dietary copper (Cu) sources and levels on growth performance in growing pigs (n = 6/treatment)

Cu source	Added Cu level (mg/kg)	IBW (kg)	FBW (kg)	ADG (kg)	ADFI (kg)	G:F
CuSO4	0	30.60	48.70b	0.65	1.94	0.33
	50	30.44	50.24ab	0.71	2.07	0.34
	100	30.72	49.94ab	0.69	2.02	0.34
CuAA	0	30.60	48.70b	0.65	1.94	0.33
	50	30.94	51.66ab	0.74	2.03	0.37
	100	31.28	51.80ab	0.73	2.00	0.37
CuHMB	0	30.60	48.70b	0.65	1.94	0.33
	50	31.44	51.62ab	0.72	2.02	0.36
	100	32.14	52.88a	0.74	1.99	0.37
SEM		0.84	1.33	0.04	0.04	0.02
p-value for source × level		0.147	0.044	0.150	0.840	0.166
Main effect of source
CuSO4		30.59	49.63	0.68	2.01	0.34
CuAA		30.94	50.72	0.71	1.99	0.36
CuHMB		31.39	51.07	0.70	1.98	0.35
SEM		0.46	0.80	0.02	0.02	0.01
p-value for source		0.467	0.418	0.690	0.622	0.481
Main effect of level
	0	30.60	48.70b	0.65b	1.94b	0.33
	50	30.94	51.17ab	0.72a	2.04a	0.35
	100	31.38	51.54a	0.72a	2.00a	0.36
SEM		0.46	0.74	0.02	0.02	0.01
p-value for level		0.491	0.019	0.015	0.001	0.299

Values with different superscripts in the same column are significantly different (p < 0.05).
IBW, initial body weight; FBW, final body weight; ADG, average daily gain; ADFI, average daily feed intake; G:F, gain to feed; CuSO₄, copper sulfate; CuAA, Cu-amino acid complex; CuHMB, Cu-hydroxy-4-methylthio butanoate chelate complex.