Table 2. Effects of dietary Cu concentrations and sources on growth performance in broiler chickens

		Weight gain (g/bird)			Feed intake (g/bird)			FCR
		0 to 14 d	15 to 35 d	0 to 35 d	0 to 14 d	15 to 35 d	0 to 35 d	0 to 14 d	15 to 35 d	0 to 35 d
Cu source × Concentration
INO (ppm)	16	317	1,366	1,683	480	2,213	2,693	1.52	1.62	1.60
	40	324	1,372	1,696	492	2,214	2,706	1.52	1.61	1.60
	80	322	1,377	1,699	492	2,172	2,665	1.53	1.58	1.57
	120	323	1,397	1,719	492	2,225	2,717	1.53	1.59	1.58
HME (ppm)	16	320	1,366	1,686	486	2,185	2,671	1.52	1.60	1.58
	40	323	1,409	1,731	493	2,225	2,718	1.53	1.58	1.57
	80	333	1,379	1,711	501	2,172	2,673	1.51	1.58	1.56
	120	329	1,377	1,706	500	2,202	2,703	1.52	1.60	1.58
Pooled SEM		1.72	5.69	5.63	2.29	14.41	14.78	0.01	0.01	0.01
Contrast
HME vs INO		0.171	0.216	0.717	0.688	0.762	0.547	0.418	0.908	0.519
Effect of INO level
SEM		2.29	9.04	8.72	2.93	23.54	24.05	0.01	0.01	0.01
Linear		0.517	0.253	0.173	0.209	0.978	0.902	0.524	0.385	0.460
Quadratic		0.512	0.715	0.833	0.296	0.608	0.704	0.775	0.757	0.798
Effect of HME level
SEM		2.54	7.08	7.17	3.49	17.10	17.74	0.01	0.01	0.01
Linear		0.088	0.988	0.516	0.107	0.987	0.771	0.835	0.974	0.873
Quadratic		0.529	0.116	0.077	0.570	0.890	0.813	0.966	0.343	0.376

FCR, feed conversion ratio; INO, copper sulfate; HME, hot melt extrusion copper sulfate.