Eficácia in vitro de extratos aquosos de plantas no controle de nematódeos gastrintestinais de bovinos
Fonseca, Leydiana DuarteVieira, Thallyta MariaLázaro, Sirlene FernandesSilva, Maria Luíza FrançaFerreira, Adriano Vinícius de PaivaBastos, Gabriela AlmeidaMorais-Costa, FranciellenMartins, Ernane RonieDuarte, Eduardo Robson
Background: Gastrointestinal helminthes in cattle had prejudge performance and productivity of animals. Affect beef cattleand dairy, generating huge economic losses. Commercial anthelmintics have been administered improperly, promotingthe selection of resistant populations, in addition to increasing production costs and waste accumulate in animal productsand the environment. It is therefore of great importance to find new alternatives as control. In this quest, was aimed withthis study to evaluate the in vitro efficacy of plant aqueous extracts in the inhibition of larval development assay (ILDA)and inhibition of hatchability assay (IHA) of gastrointestinal nematodes of cattle.Materials, Methods & Results: The ILDA was performed by quantitative coproculture , with aqueous extracts of the leavesof Acrocomia aculeata, Anacardium occidentale, Caryocar brasiliense, Cymbopogon citratus, Mangifera indica var. Ubáand Musa spp. cv. Prata-anã on the concentration of 100 mg/mL. In the IHA was evaluated the aqueous extracts of leavesand fruit peels of C. brasiliense, at the concentrations 15.00, 7.50, 3.75 and 1.88 mg/mL. The controls of assays wereivermectin (16 μg/mL) and levamisole phosphate solution (15 mg/ml), respectively, and water in both tests. Efficiencieswere calculated and count data submitted to analysis of variance and the means were compared by Tukey test (P < 0.01).With the probit regression analysis, we determined the lethal concentration for inhibition of 50 and 90% hatchability (LC50and LC90). Still, the levels of condensed tannins from aqueous extracts of the leaves and fruit peels of C. brasiliense werequantified. In ILDA, the extract of C. brasiliense showed efficacy of 91.29% and did not differ from ivermectin (P < 0.01).The other extracts did not obtain satisfactory efficacy and were similar to water (P < 0.01). In IHA the efficacy was over...(AU)
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