Optimal dietary copper requirements and relative bioavailability for weanling pigs fed either copper proteinate or tribasic copper chloride

Table 6 Effect of amount and source of dietary copper on plasma, intestinal, and liver Zn and Fe concentrations of weanling pigs

	Copper source¹	Copper level, mg/kg						Pooled SEM	P-value
	Copper source¹	0	20	40	80	160	200	Pooled SEM	Treatment	Linear	Quadratic
Plasma Zn, μg/mL	TBCC	1.63	1.63	1.65	1.64	1.67	1.66	0.02	0.509	0.066	0.170
Plasma Zn, μg/mL	CuPro	1.63	1.66	1.67	1.70	1.67	–	0.03	0.482	0.265	0.165
Liver Zn, mg/kg	TBCC	315.96^a	318.83^a	310.89^a	309.09^ab	287.04^b	288.11^b	4.96	< 0.001	< 0.001	< 0.001
Liver Zn, mg/kg	CuPro	315.96	317.92	316.48	313.83	305.50^*	–	4.16	0.379	< 0.001	0.023
Duodenum Zn, mg/kg	TBCC	109.51	108.66	110.67	110.24	110.56	111.71	0.87	0.068	0.009	0.037
Duodenum Zn, mg/kg	CuPro	109.51	111.09	108.41	110.08	111.12	–	1.05	0.362	0.345	0.529
Jejunum Zn, mg/kg	TBCC	113.34	114.16	114.79	114.25	114.73	115.73	0.94	0.626	0.106	0.279
Jejunum Zn, mg/kg	CuPro	113.34	116.69^*	115.64^*	115.98^*	116.22^#	–	1.05	0.241	0.262	0.303
Plasma Fe, μg/mL	TBCC	4.16	4.12	4.17	4.27	4.25	4.34	0.17	0.945	0.314	0.606
Plasma Fe, μg/mL	CuPro	4.16	4.24	4.21	4.27	4.23	–	0.13	0.988	0.770	0.876
Liver Fe, mg/kg	TBCC	368.19	365.71	362.06	361.25	375.93	374.49	7.80	0.682	0.194	0.299
Liver Fe, mg/kg	CuPro	368.19	360.99	366.26	372.85	372.71	–	12.25	0.954	0.550	0.838
Duodenum Fe, mg/kg	TBCC	249.15	248.53	248.02	246.48	245.72	246.92	1.13	0.291	0.040	0.042
Duodenum Fe, mg/kg	CuPro	249.15	245.83^*	246.59	245.59	246.44	–	1.26	0.323	0.348	0.206
Jejunum Fe, mg/kg	TBCC	140.26	140.53	139.83	140.47	140.65	140.18	0.27	0.368	0.683	0.830
Jejunum Fe, mg/kg	CuPro	140.26	139.29	140.65^*	140.37	140.48	–	0.60	0.548	0.475	0.758

^a-b 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
^# tend to be different from the corresponding TBCC group at the same supplemented copper level, 0.05 < P < 0.10
¹TBCC tribasic copper chloride, CuPro copper proteinate

ISSN: 2049-1891