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Table 5 Effect of amount and source of dietary copper on plasma, bile, intestinal, and liver copper concentrations of weanling pigs

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

  Copper source1 Copper level, mg/kg Pooled SEM P-value
0 20 40 80 160 200 Treatment Linear Quadratic
Plasma, μg/mL TBCC 1.40 1.41 1.41 1.39 1.38 1.36 0.02 0.320 0.029 0.074
CuPro 1.40 1.42 1.40 1.39 1.38 0.02 0.390 0.144 0.350
Bile, μg/mL TBCC 0.92d 0.89d 1.95c 2.87b 3.23a 3.20a 0.03 < 0.001 < 0.001 < 0.001
CuPro 0.92e 1.10d, * 2.36c, * 3.21b, # 3.44a, * 0.04 < 0.001 < 0.001 < 0.001
Liver, mg/kg TBCC 23.43b 23.58b 24.12b 24.00b 32.96a 33.92a 0.61 < 0.001 < 0.001 < 0.001
CuPro 23.43c 23.58c 23.77c 31.91b, * 37.01a, * 0.41 < 0.001 < 0.001 < 0.001
Duodenum, mg/kg TBCC 2.80bc 2.77c 2.80bc 2.89b 3.41a 3.38a 0.02 < 0.001 < 0.001 < 0.001
CuPro 2.80c 2.80c 2.83c 3.06b, * 3.58a, * 0.02 < 0.001 < 0.001 < 0.001
Jejunum, mg/kg TBCC 5.01c 4.97c 5.05bc 5.07bc 5.15b 5.28a 0.03 < 0.001 < 0.001 < 0.001
CuPro 5.01c 5.09bc, * 5.10bc 5.12b, * 5.30a, * 0.02 < 0.001 < 0.001 < 0.001
  1. a-d Means within a row without a common superscript letter are different (P < 0.05)
  2. * different from the corresponding TBCC group at the same supplemented copper level, P < 0.05
  3. # tend to be different from the corresponding TBCC group at the same supplemented copper level, 0.05 < P < 0.10
  4. 1TBCC tribasic copper chloride, CuPro copper proteinate