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Canadian Journal of Veterinary Research logoLink to Canadian Journal of Veterinary Research
. 1999 Jul;63(3):193–200.

Pharmacokinetics of enrofloxacin given by the oral, intravenous and intramuscular routes in broiler chickens.

K Bugyei 1, W D Black 1, S McEwen 1
PMCID: PMC1189547  PMID: 10480461

Abstract

Enrofloxacin was given to broiler chickens, 3 groups of 6 birds each, at a dose of 5 mg/kg. Routes of administration were intravenous (i.v.), intramuscular (i.m.) and oral (p.o.) and blood samples were collected from the jugular vein for determination of serum drug levels over a 54-hour period after administration. Drug levels were determined using Bacillus subtilis spore suspension on Meuller-Hinton antibiotic medium. Intravenous administration produced drug levels which followed a bi-exponential decay according to the model C = 101e(-1.84(t)) + 1.30e(-0.06(t)). After i.m. administration, the mean Cmax observed (2.01 microg/mL) occurred at 1 h and levels were detected for up to 48 h. The mean time to maximum concentration (Tmax) for the birds occurred at 0.79 h. The model describing serum concentrations after i.m. administration was C = 1.35e(-0.48(t)) + 1.27e(-0.07(t)) - 2.06e(-2.1(t)). Serum concentrations after oral administration were lower and the mean +/- standard error of mean, of the maximum concentrations (Cmax) was 0.99 microg/mL at 2 h after administration. The mean residence times after the 3 routes of administration were not significantly different and ranged from 12.5-13.7 h. Bioavailability by the oral route was 80.1%. Dialysis of chicken plasma vs saline indicated that the protein binding was 22.7%.

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Selected References

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