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Efficacy of Lippia javanica leaf extract against cattle ticks
J. Madzimure, E. T. Nyahangare, H. Hamudikuwanda, T. Hove, P. C. Stevenson, S. R. Belmain, B. M. Mvumi
TICKS are a constant threat to livestock in southern Africa, but the application of synthetic antiparasitics may be impractical or unaffordable. This study evaluated the efficacy of Lippia javanica aqueous leaf extract in controlling cattle ticks.
L javanica was harvested at a research station in Zimbabwe; 7 kg of plant material was crushed and soaked in 28 litres water for 24 hours, before filtration to produce a 25 per cent (w/v) stock solution. Twenty Mashona steers were randomly assigned to one of five treatments: 5, 10, or 20 per cent L javanica extract, tap water (negative control), or commercial amitraz-based antiparasitic spray (positive control). The steers were left untreated for one month before the start of the study to allow natural tick infestation, and the number and types of ticks were recorded. The cattle were then sprayed weekly, for seven weeks (April to May 2008), with 5 litres of the assigned treatment. Animals were evaluated daily for signs of disease, and blood samples were collected and examined for evidence of haemoparasites. The acute oral toxicity …