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Table 10 Multiple linear regressions of ADG, FCR, plasma enzyme activities, and jejunal Cu concentrations on daily analyzed dietary Cu intake1

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

Dependent variables Regression equation2 R2 P-value
ADG Y = 296.113 + 0.8916X1 + 1.63437X2 0.61 < 0.0001
FCR Y = 1.662–0.003535X1 − 0.006068X2 0.92 < 0.0001
ALP Y = 1.629 + 0.018343X1 + 0.028563X2 0.88 < 0.0001
CER Y = 74.487 + 0.11645X1 + 0.306X2 0.79 < 0.0001
Cu/Zn SOD Y = 131.045 + 0.2185X1 + 0.4489X2 0.32 0.0019
GSH-Px Y = 724.255 + 0.6748X1 + 0.7661X2 0.86 < 0.0001
MDA Y = 2.326–0.011156X1 − 0.014865X2 0.37 0.0005
Jejunal Cu Y = 5.004 + 0.00168X1 + 0.00349X2 0.77 < 0.0001
  1. 1 Daily dietary analyzed Cu intake = ADFI times analyzed supplemental dietary Cu content (analyzed total Cu content – background Cu content) for each respective Cu source
  2. 2 X1 is the analyzed daily added Cu intake (mg) from tribasic copper chloride, and X2 is the analyzed daily added Cu intake (mg) from Cu proteinate
  3. ALP alkaline phosphatase, CER ceruloplasmin, Cu/Zn SOD Cu, Zn-superoxide dismutase, GSH-Px glutathione peroxidase, MDA malondialdehyde