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Table 1 Plasmatic concentration of morphine and its metabolites in the mare (ng/ml)

From: Morphine plasmatic concentration in a pregnant mare and its foal after long term epidural administration

Days

Morphine

M3G

M6G

36

5.88

213.87

7.59

36

19.89

307.85

12.96

36

8.25

278.57

10.36

36

6.16

241.21

8.48

42

63.18

149.26

9.45

49

1.66

93.01

3.08

50

4.82

125.20

5.79

51

1.66

57.82

2.23