This study describes the pharmacokinetics of enrofloxacin following oral and i.v. administration to goral (Nemorrhaedus goral arnouxianus). The objective of this study was to expand upon current antimicrobial treatment options available for use in goral by measuring plasma concentrations and examining the pharmacokinetics of enrofloxacin in these animals. Two single-dose treatments of enrofloxacin were administered to four goral in a crossover design. Single-dose treatments consisted of administration of injectable enrofloxacin i.v. (5 mg/kg) and enrofloxacin tablets (136 mg chewable tablets) dissolved in a grain slurry and administered p.o. (10 mg/kg). Plasma levels of enrofloxacin and its metabolite ciprofloxacin were measured with the use of high-performance liquid chromatography with UV detection. Plasma volume of distribution for i.v. enrofloxacin was 2.15 ± 1.01 L/kg, with a mean elimination half-life of 13.3 hr and total body clearance of 0.19 ± 0.14 L/kg/hr. The maximum plasma concentration measured for oral enrofloxacin was 2.77 μg/ml, with a mean half-life of 5.2 hr and systemic availability of 14.6%. The area under the plasma concentration over time curve (AUC) for oral enrofloxacin was 21.06 μg/hr/ml. The area under the plasma concentration over time curve generated for oral enrofloxacin in goral yields an area under the plasma concentration over time curve to minimum inhibitory concentration ratio > 100 for many gram-positive and gram-negative bacterial pathogens common to small ruminants. Based on these results, oral enrofloxacin may be considered for further study as a treatment option for susceptible infections in goral.
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Vol. 37 • No. 2