Licking behaviour and environmental contamination arising from pour-on ivermectin for cattle

International Journal for Parasitology
C M LaffontP L Toutain

Abstract

Pour-on formulations of endectocides are extensively used to treat and control systemic parasitic diseases in cattle, worldwide. The purpose of the present study was to investigate the influence of the natural licking behaviour of cattle on the plasma and faecal disposition of topically administered ivermectin. Twelve Holstein cattle were given one single intravenous (i.v.) (200 microg/kg) and topical (500 microg/kg) administration of ivermectin at a 5-month interval. For the pour-on administration, the animals were allocated into two groups (n=6): one control group (lickers) and one group where licking was prevented (non-lickers). Ivermectin plasma (total) clearance (270+/-57.4 ml/kg/day) was very homogeneous among the 12 cattle. In contrast, major differences between lickers and non-lickers were observed following pour-on administration. Prevention of licking resulted in an extended terminal plasma half-life (363+/-16.2 vs. 154+/-7.4 h in lickers) and in a lower and less variable systemic availability of ivermectin (19+/-4.9 vs. 33+/-18.5% in lickers). More importantly, nearly 70% of the pour-on dose was recovered as parent drug in the faeces of lickers vs. only 6.6% in non-lickers. Altogether, these results are consistent wi...Continue Reading

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