. 2020 May 22;11:54. doi: 10.1186/s40104-020-00457-y

Table 3.

Effect of amount and source of dietary copper on growth performance of weanling pigs

	Copper source¹	Copper level, mg/kg								Pooled SEM	P-value
	Copper source¹	0	5	10	20	40	80	160	200	Pooled SEM	Treatment	Linear	Quadratic
BW d 0, kg	TBCC	7.30	7.43	7.40	7.43	7.43	7.23	7.27	7.33	0.30	0.999	0.678	0.892
BW d 0, kg	CuPro	7.30	7.41	7.44	7.37	7.47	7.33	7.45	–	0.37	0.999	0.865	0.984
BW d 38, kg	TBCC	18.66	18.83	18.91	18.95	19.48	19.82	20.88	20.87	0.83	0.362	0.003	0.013
BW d 38, kg	CuPro	18.66	18.87	19.01	19.24	19.97^*	21.18^*	21.13	–	0.79	0.166	0.004	0.006
ADG, g	TBCC	298.9^b	300.1^b	302.8^b	303.2^b	317.2^b	331.2^ab	358.1^a	356.2^a	7.78	0.032	0.003	< 0.001
ADG, g	CuPro	298.9^b	301.5^b	304.4^b	312.4^b	328.9^b	364.6^{a, *}	359.9^a	–	6.80	0.002	< 0.001	< 0.001
ADFI, g	TBCC	492.6	497.4	501.5	494.8	500.0	504.5	513.0	519.9	21.68	0.985	0.218	0.475
ADFI, g	CuPro	492.6	494.4	492.9	497.6	502.3	518.1	513.1	–	10.65	0.491	0.144	0.069
FCR	TBCC	1.65^ab	1.66^a	1.66^a	1.63^ab	1.58^bc	1.52^cd	1.43^e	1.46^de	0.02	<0.001	0.001	0.111
FCR	CuPro	1.65^a	1.64^a	1.62^{ab, *}	1.59^{b, *}	1.53^{c, *}	1.42^{d, *}	1.43^d	–	0.01	<0.001	< 0.001	< 0.001

^a-d Means within a row without a common superscript letter are different (P < 0.05)

* different from the corresponding TBCC group at the same supplemented copper level, P < 0.05

¹TBCC tribasic copper chloride, CuPro copper proteinate