Pharmacokinetics of doxycycline after a single intravenous,oral or intramuscular dose in Muscovy ducks (Cairina moschata) |
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| Authors: | F Yang N Sun Z S Zhao G Y Wang M F Wang |
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| Institution: | 1. Department of Veterinary Pharmacology, College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China;2. Institute of Special Animal and Plant Sciences, Chinese Academy of Agricultural Sciences, Changchun, PR China |
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| Abstract: | The pharmacokinetics of doxycycline in ducks were investigated after a single intravenous (IV), intramuscular (IM) or oral (PO) dose at 20 mg/kg body weight. The concentrations of doxycycline in plasma samples were assayed using a high performance liquid chromatography method, and pharmacokinetic parameters were calculated using a non-compartmental model. After IV administration, doxycycline had a mean (±SD) distribution volume (Vz) of 1761.9 ± 328.5 ml/kg and was slowly eliminated with a terminal half-life (t1/2λz) of 21.21±1.47 h and a total body clearance (Cl) of 57.51 ± 9.50 ml/h/kg. Following PO and IM administration, doxycycline was relatively slowly absorbed – the peak concentrations (Cmax) were 17.57 ± 4.66 μg/ml at 2 h and 25.01 ± 4.18 μg/ml at 1.5 h, respectively. The absolute bioavailabilities (F) of doxycycline after PO and IM administration were 39.13% and 70.71%, respectively. The plasma profile of doxycycline exhibited favourable pharmacokinetics characteristics in Muscovy ducks, such as wide distribution, relatively slow absorption and slow elimination, though oral bioavailability was low.
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