Dinâmica populacional de Rhipicephalus microplus em uma região de clima tropical semiúmido
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Data
2018-02-28
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Universidade Federal de Goiás
Resumo
The knowledge of population dynamics allows us to study the variations in the abundance of populations of living beings. Knowledge of the abundance of ticks that parasitize lactating cattle in a given region is important when considering the direct damage that these ectoparasites cause and their ability to transmit pathogens to animals. The aim of the present study was to characterize the population dynamics of Rhipicephalus microplus in naturally infested mestizo dairy cattle maintained in a rotational grazing system for 12 months in a semi - humid tropical region in the state of Goiás. the selected cattle had the female ticks counted (4.5 to 8.0 mm). A flannel-dragging technique was also carried out in the pasture for the capture and subsequent counting of R. microplus larvae. The meteorological data were collected during the study to be used in regression and variance analyzes. Based on the experimental design used, it was possible to observe the increase in the number of tick generations during the experiment, for five generations during the year. It was also observed that the climatic variables such as humidity, temperature and rainfall had a direct relation with the amount of larvae present in the pasture (P> 0.05). The number of larvae present in pastures presented significant negative correlation (P≤0.05) with rainfall (P = 0.0001), ambient temperature (P = 0.0005) and relative humidity (P = 0.0120). On the other hand, the average parthenogenic counts in the animals' body did not show a significant correlation (P> 0.05) with the climatological parameters. In summary, it was possible to verify the presence of five generations / year of R. microplus in the tropical semi-humid region, besides the influence of the climatic variables on the non-parasitic phase of the bovine tick. These results are related to the biological, ecological, population and behavioral aspects of R. microplus, allowing us to help map an epidemiological profile in the region and to define future strategies for the management and control of this ectoparasite of cattle.
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Carrapato , Estratégias , Gerações , Larvas , Sazonalidade , Tick , Strategies , Generations , Larvae , Seasonality
Citação
NICARETTA, J. E. Dinâmica populacional de Rhipicephalus microplus em uma região de clima tropical semiúmido. 2018. 61 f. Dissertação (Mestrado em Ciência Animal) - Universidade Federal de Goiás, Goiânia,
2018.