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

Table 11 Relative bioavailability values (RBV) of copper proteinate (CuPro) based on slope ratios from multiple linear regressions of ADG, FCR, plasma enzyme activities, and jejunal Cu concentrations on daily analyzed dietary Cu intake¹

Dependent variables	Copper source²	Regression coefficients		RBV		P-value³
Dependent variables	Copper source²	Slope	SE	%	SE	P-value³
ADG	TBCC	0.8916	0.18485	100
ADG	CuPro	1.63437	0.18347	183	34.9	0.0006
FCR	TBCC	−0.003535	0.00024	100
FCR	CuPro	−0.006068	0.00024	172	17.0	< 0.0001
ALP	TBCC	0.018343	0.00195	100
	CuPro	0.028563	0.00194	156	12.7	< 0.0001
CER	TBCC	0.11645	0.06564	100
	CuPro	0.306	0.06538	263	120.1	0.0013
Cu/Zn SOD	TBCC	0.2185	0.17132	100
	CuPro	0.4489	0.17063	205	126.4	0.1383
GSH-Px	TBCC	0.6748	0.05870	100
	CuPro	0.7661	0.05846	114	8.0	0.0678
MDA	TBCC	−0.011156	0.00396	100
	CuPro	−0.014865	0.00394	133	36.9	0.279
Jejunal Cu	TBCC	0.00168	0.00035	100
	CuPro	0.00349	0.00035	208	38.3	< 0.0001

^a Daily dietary analyzed Cu intake = ADFI times analyzed supplemental dietary Cu content (analyzed total Cu content – background Cu content) for each respective Cu source
^bTBCC tribasic copper chloride, CuPro copper proteinate
^cP-value for the difference in slopes among Cu sources
ALP alkaline phosphatase, CER ceruloplasmin, Cu/Zn SOD Cu, Zn-superoxide dismutase, GSH-Px glutathione peroxidase, MDA malondialdehyde

ISSN: 2049-1891