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Table 6 Effect of amount and source of dietary copper on plasma, intestinal, and liver Zn and Fe 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 Zn, μg/mL TBCC 1.63 1.63 1.65 1.64 1.67 1.66 0.02 0.509 0.066 0.170
CuPro 1.63 1.66 1.67 1.70 1.67 0.03 0.482 0.265 0.165
Liver Zn, mg/kg TBCC 315.96a 318.83a 310.89a 309.09ab 287.04b 288.11b 4.96 < 0.001 < 0.001 < 0.001
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
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
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
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
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
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
CuPro 140.26 139.29 140.65* 140.37 140.48 0.60 0.548 0.475 0.758
  1. a-b 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