Parameter

Healthy

Infected

LSD
(Pr > F)

S

BS

S

BS

C° (mg/ml)

42.35(4.20)b

41.65(2.12)b

45.05(3.88)b

51.60(2.95)a

4.536(0.001)

A  (mg/ml)

26.22(2.60)ab

24.70(1.60)b

25.40(2.27)ab

27.70(1.35)a

2.705(0.148)

a  (h-1)

0.639(0.04)a

0.591(0.05)ab

0.560(0.06)bc

0.512(0.02)c

0.061(0.003)

t1/2(a) (h)

1.089(0.08)c

1.178(0.09)bc

1.248(0.13)ab

1.354(0.05)a

0.125(0.002)

B  (mg/ml)

16.13(1.69)c

16.95(1.93)c

19.65(1.75)b

23.27(1.99)a

2.469(0.0001)

b  (h-1)

0.169(0.004)a

0.149(0.004)b

0.144(0.008)b

0.127(0.003)c

0.007(0.0001)

t1/2(b) (h)

4.099(0.10)c

4.669(0.12)b

4.841(0.25)b

5.460(0.12)a

0.215(0.0001)

Vc  (L/kg)

0.467(0.05)a

0.481(0.02)a

0.447(0.04)a

0.389(0.02)b

0.045(0.002)

Vd(area) (L/kg)

0.875(0.11)a

0.870(0.10)a

0.769(0.09)ab

0.658(0.06)b

0.124(0.005)

Vd(ss)(L/kg)

0.681(0.09)a

0.694(0.07)a

0.628(0.09)ab

0.545(0.05)b

0.101(0.026)

Cl(B)  (L/kg/h)

0.148(0.02)a

0.129(0.01)b

0.110(0.008)c

0.083(0.006)d

0.014(0.0001)

AUC (µg/ml. h-1)

0.137(0.01)c

0.156(0.01)c

0.183(0.01)b

0.241(0.02)a

0.020(0.0001)

AUMC (µg/ml.h-2)

6..337(0.29)c

4.838(0.40)d

7.026(0.22)b

17.913(0.38)a

0.443(0.0001)

MRT  (h)

0.047(0.003)b

0.031(0.001)d

0.039(0.004)c

0.075(0.004)a

0.004(0.0001)

(a,b,c,d)Means with the same letter in the same row are not significantly different.
LSD = Least significant difference.
Table 1: Mean (SD) pharmacokinetic parameters of florfenicol in serum (S) and bronchial secretions (BS) after intravenous injection of 20 mg/kg b wt in healthy and Pasteurella multocida-infected calves (n = 5).