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Table 4 Plasma concentrations of macroelements and microelements of dairy cows, by lactation states

From: Mineral status and enteric methane production in dairy cows during different stages of lactation

  Lactation stage1 Statistics
Minerals Early Middle Late SEM P-value
Macroelements
 Na, g/L 3.12 3.08 3.12 0.013 0.311
 K, mg/dL 16.3 15.8 16.1 0.230 0.689
 P, mg/dL 5.95 5.86 5.94 0.129 0.954
 Ca, mg/dL 8.04 8.32 8.69 0.173 0.316
 Mg, mg/dL 2.43 2.25 2.30 0.035 0.095
Microelements
 Fe, mg/L 1.799 1.823 2.006 0.074 0.467
 Zn, mg/L 0.774 0.777 0.885 0.025 0.105
 Cu, mg/L 0.729 0.805 0.788 0.028 0.517
 Mn, μg/L 14.56 13.20 15.58 1.557 0.842
 Zn/Cu ratio 1.204 1.084 1.017 0.053 0.427
Albumin, g/L 33.68 36.51 36.85 1.465 0.607
  1. 1Early = early-stage lactation (1–100 days); Middle = middle-stage lactation (101–250 days); Late = late-stage lactation (> 250 days)