Morfologia e biologia de Rhipicephalus sanguineus (Latreille, 1806) (Ixodidae) submetido ao regulador de crescimento de artr?podes fluazuron

• Autor(a) principal: Melo, Raquel Moreira Pires dos Santos
• Data de Publicação: 2007
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFRRJ
• Texto Completo: https://tede.ufrrj.br/jspui/handle/tede/740
• topic: Rhipicephalus sanguineus; benzoilfenilur?ia; controle; bezoilphenil- urea; control; Medicina Veterin?ria

The purpose of this study is to follow up the morphology and biology of Rhipicephalus sanguineus after being submitted to the arthropods growth regulator fluazuron on rabbits. This study took place in the dependence of the Laboratories of Development of Parasiticides Products (LDPP) and Acari Morfophisiology (LAM), both part of the Department of Animal Parasitology of Veterinary Institute of Universidade Federal Rural do Rio de Janeiro (UFRRJ), in Serop?dica, (22?44'38"S, 43?42'27"W). The growth regulators represents a new category that has been employed as ectoparasiticide on pets. This chemical group do not presents a knockdown effect, but does act slowly and gradually interfering on parasite s growth and development. The AGRs are classified as per their mechanism of action. The first group is a juvenile hormone analogue, benzoilphenil-urea inhibiting the chitin synthesis. The second are the inhibitors of deposition of chitin, triazin s and pyrimidin s derived. The FZN was the first growth regulator registered for ixodides tick s control. Four phases were analyzed; each one using ten rabbits divided in control and treated. At phase I (larvae stage), the animals were infested with R. sanguineus larvae on the ratio of 2500 larvae/rabbit. At phase II (nymph stage), with the ratio of 200 nymphs/rabbit. At phase III (adults), the animals were infested with 25 males and 25 females/rabbit. At phase IV, the infestation was done with 2500 larvae from engorged female ticks recovered on phase III. Fluazuron was applied as a pour on formulation on each phase using 10mg/kg. The experimentations during the parasitic phase had been carried through in ambient conditions, the period of August the November of 2006, and of the not parasitic phase in controlled conditions of laboratory (27 ? 1 ?C and 80 ? 10% UR, in escotofase). Parasitic and not parasitic stages of larvae, nymphs and adults were evaluated in different parameters. The FZN changed the biology of R. sanguineus, such as: increasing the pre-posture period; reducing the weight of eggs mass; increasing the incubation period of eggs; reducing the rate of reproductive efficiency, inhibiting the ecdyse process from larvae to nymph and from nymph to adult, efficacy in the inhibition of female reproduction and all recovered specimen from all the stages in the treated group showed sensible tegument, elliptical body and lethargic behavior. It is concluded that fluazuron employed in the dose of 10mg/kg of corporal weight in rabbits promoted alterations morphologies, biological and mannering in R. sanguineus that they indicate the possibility of job of this AGR in the control of this carrapato, with the particularitity in the reduction of the reinfesta??o tax. However new studies need to be carried through aiming at the effectiveness of fluazuron in the control of R. sanguineus when used in dogs. The use of rabbits was a preliminary test to indicate or not it activity of fluazuron on sanguineus carrapato R. sanguineus.