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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)