THE EFFICACY OF DIFFERENT ACARICIDES AGAINST THE HARD TICK DERMACENTOR MARGINATUS ON INFESTED SHEEP

Published in Scientific Works. C Series. Veterinary Medicine, Vol. LVIII ISSUE 4
Written by Tiberiu Constantin, Iulia Paraschiv, Mariana Ioniţă, Ioan Liviu Mitrea

The aim of the present study was to evaluate the efficacy of four acaricids, from different pharmacologic groups, in control of tick infestation in sheep. Additionally, clinical specific aspects of the infestations were registered. The study was carried out during of March – April 2012, in a southern area of Romania (Colibasi village, Giurgiu County). The therapeutic efficacy of four different acaricides: Deltamethrin (pirethroid), Amitraz (formamidine), Diazinon (organophosphate), and Ivermectine (macrocyclic lactone) on natural tick infestation in sheep was evaluated. The animals (n=40) were divided into four groups (n=10/group) corresponding to the four used drugs. The first three products were used by dipping, in concentration of 0.05% for Delthametrin, 0.05% for Amitraz, and 0.04% for Diazinon. Ivermectine (1%) was subcutaneously injected (0.2 mg/kg). The animals were examined before and after treatment at 3, 5, 7, 14 and 21 days. The number of ticks per animal, the main elective body regions for tick attachment, and the associated lesions, were also registered. A total number of 1054 ticks (938 females, 116 males) were collected from infested sheep, all belonging to the Dermacentor marginatus species. The body areas highly infested were, in order of prevalence: the substernal area (63.6%), sides of the neck (14.2%) and the tail (7.1%). Lesions associated with tick infestation consisted of local irritations and inflammations, nodular dermatitis and micro abscesses. The best acaricidal efficacy was registered for Delthametrin (79.5%, at 3 days and 100% at 5 days p.t.) and Amitraz (90.4%, 96.4% and 100% at 3, 5 and 7 days p.t. respectively); both acaricids preserved full protection at 14 and 21 days after treatment. Ivermectin reached maximum efficacy at 7 days p.t. (92%), afterwards dropping at 79.8% at 21 days p.t..

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Constantin T., Paraschiv I., Ioniţă M., Mitrea I. L. 2012, THE EFFICACY OF DIFFERENT ACARICIDES AGAINST THE HARD TICK DERMACENTOR MARGINATUS ON INFESTED SHEEP. Scientific Works. C Series. Veterinary Medicine, Vol. LVIII ISSUE 4, PRINT ISSN 1222-5304, 372-379.


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