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Antiparasitic resistance of different populations of ticks (Rhipicephalus microplus) in the Western of Santa Catarina state, Brazil

Pazinato, Rafael; Klauck, Vanderlei; Kharyna Grosskopf, Rhayana; Dalla Rosa, Luciana; Volpato, Andréia; Baretta, Dilmar; Moura Stefani, Lenita; Schafer da Silva, Aleksandro.
Acta Sci. vet.; 42: 1-6, 2014.
Artigo em Inglês | VETINDEX-Express | ID: vti-475412

Resumo

Background: In Brazil, the tick Rhipicephalus microplus is a serious problem for beef and milk cattle due to the damage caused directly to the animal. Ticks are responsible for major economic losses related to production, especially in breeds of European origin, prevalent in Southern Brazil. The use of most acaricides may allow the survival of some tick that transmits this characteristic to future generations, consequently each successive treatment is a process of selection. The lack of technical guidance on how to control ticks may contribute to the emergence of new resistant strains of ticks. The objective of this study was to test the effi cacy of antiparasitic drugs on tick populations (Rhipicephalus microplus) from the Western region of Santa Catarina, Brazil.Materials, Methods & Results: Thirty-one farms participated in this study and 70 engorged female ticks were collect from each property. They were divided into seven groups of 10 specimens each. Ticks were exposed to six commercial drugs: amitraz (A); cypermethrin, chlorpyrifos, and citronellal (B); diazinon (C); diclovós and chlorpyrifos (D); cypermethrin (E); cypermethrin, chlorpyrifos, and piperonyl butoxide (F); and one group was used as a control to validate the test (G: no drug). Tests with acaricides followed standard protocols, recommended for in vitro testing. The effectiveness of the product was calculate
Biblioteca responsável: BR68.1