Ivermectina e abamectina em diferentes doses e vias de aplicação contra larvas de Cochliomyia hominivorax em bolsas escrotais de bovinos recém-castrados, provenientes da região sudeste do Brasil
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2013-12
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Resumo
The preventive effi cacy of ivermectin and abamectin
administered in different routes (subcutaneous, intramuscular and
pour-on) and doses (200 and 500mcg kg-1) against Cochliomyia
hominivorax in the scrotal sac of cattle after castration, was
evaluated. Animals from six different farms, in the state of São
Paulo and Minas Gerais, Brazil were used. For each study, 30-
45 uncastrated bulls, depending on the number of groups, were
selected. On day zero of the study, the procedure was carried out by
the method of bloody castration and the animals were treated after
this process. The effi cacy of ivermectin and abamectin administered
via the pour-on (500mcg kg-1), subcutaneous (200mcg kg-1) as well
as the effi cacy of abamectin intramuscularly (200mcg kg-1) were
evaluated. In each experiment, one group of animals was kept as
control. The animals were evaluated from the 3rd to the 14th day
after castration process/treatment. The effi cacy values for both
active principles were ≤30% the next day 10 post-treatment (PT),
and in fi ve experiments, both ivermectin and abamectin, regardless
of the route of administration, were ineffective (0.0%) on the
day 10th PT. Based on the results found in this study, conducted
in different properties from southeastern Brazil, both ivermectin
and abamectin, when used the protocol presented, were considered
ineffective in preventing scrotal myiasis in bulls, irrespective of the
route of administration and dose used.
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Eficácia preventiva, Macrolactonas, Miíases, Preventive efficacy, Macrolactones, Myiasis, Resistance
Citação
LOPES, Welber Daniel Zanetti; TEIXEIRA, Weslen Fabricio Pires; FELIPPELLI, Gustavo; CRUZ, Breno Cayeiro; MACIEL, Willian Giquelin; MATOS, Lucas Vinicius Shigaki de; PEREIRA, João Carlos Melo; BUZZULINI, Carolina; SOARES, Vando Edésio; SANTOS, Thais Rabelo dos; OLIVEIRA, Gilson Pereira de; COSTA, Alvimar José da. Ivermectina e abamectina em diferentes doses e vias de aplicação contra larvas de Cochliomyia hominivorax em bolsas escrotais de bovinos recém-castrados, provenientes da região sudeste do Brasil. Ciência Rural, Santa Maria, v. 43, n. 12, p. 2195-2201, dez. 2013.