200 resultados para Platyhelminth Parasites
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Estudaram-se os efeitos do pastejo alternado de ovinos e bovinos e do pastejo rotacionado sobre o controle da verminose em ovelhas. Utilizou-se uma área experimental composta por três módulos de 1,67ha cada. Os módulos foram subdivididos em oito piquetes. Vinte ovelhas foram colocadas no módulo 1 e quatro bovinos adultos no módulo 2. Os animais permaneceram em cada piquete do módulo por cinco dias, totalizando 40 dias de permanência em cada módulo. Ao final desse período, as ovelhas foram transferidas para o módulo onde estavam os bovinos e estes para o módulo onde estavam os ovinos, mantendo esse esquema até o final do experimento. Um grupo-controle de 20 ovelhas foi mantido, também em sistema rotacionado, em um terceiro módulo, sem compartilhar a pastagem. As ovelhas submetidas ao manejo com bovinos apresentaram o menor grau de infecção por nematódeos gastrintestinais e os maiores valores de volume globular. O pastejo rotacionado de ovinos, sem a utilização de bovinos, não foi eficiente no controle da verminose das ovelhas. A utilização do pastejo rotacionado e alternado de ovinos e bovinos adultos exerceu efeito benéfico significativo no controle da verminose ovina.
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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The objective of this study was to determine the level of resistance of Haemonchus contortus and Trichostrongylus colubriformis in sheep to levamisole albendazole ivermectin moxidectin closantel and trichlorfon The parasites were isolated from sheep naturally infected by gastrointestinal nematodes and were then kept in monospecifically infected lambs for production of infective larvae (L3) of both species Forty-two lambs at three months of age were simultaneously artificially infected with 4000 L3 of H contortus and 4000 L3 of T colubriformis The animals were allocated Into seven groups with six animals each that received one of the following treatments Group 1-control no treatment Group 2-moxidectin (0 2 mg/kg body weight (BW)) Group 3-closantel (10 mg/kg BW) Group 4-trichlorfon (100 mg/kg BW) Group 5-levamisole phosphate (4 7 mg/kg BW) Group 6-albendazole (5 0 mg/kg BW) and Group 7-ivermectin (0 2 mg/kg BW) Nematode fecal egg counts (FEC) were carried out on the day of treatment and again at 3 7 10 and 14 days post-treatment on the same occasions composite fecal cultures were prepared for each group for production of L3 which were identified into genus The animals were sacrificed for worm counts at 14 days after treatment The efficacy of each treatment was calculated from the arithmetic mean of the FEC or worm burden of the treated group compared with the values of the control group Only trichlorfon and moxidectin treatments resulted in a significant reduction of H contortus recorded at necropsy (73% and 45% respectively) Moxidectin reduced T colubriformis worm burdens by 82% and albendazole by 19% All other anthelmintics resulted in no significant reduction in the numbers of worms found at necropsy In conclusion the Isolates of H contortus and T colubriformis showed multiple resistance to all groups of anthelmintics tested This is the first report based on the controlled efficacy test to show resistance of T colubriformis to macrocyclic lactones in Brazil (C) 2010 Elsevier B.V. All rights reserved
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Seventy specimens of Hypsiboas albopunctatus (Anura: Hylidae) were collected and surveyed for endoparasites in Brasilia, Brazil at the end of the rainy season (February and March) in 2005. Sixteen males (22.86%) were infected by Rhabdias sp., Aplectana sp., Cosmocerca sp., and Falcaustra mascula. Rhabdias sp., a lung parasite, presented the highest prevalence (8.57%), mean intensity of infestation (1.333), and mean abundance (0.114). Moreover, this is the first report of a rhabdiasid nematode in the Hylidae in Brazil. The intestinal parasites, Cosmocerca sp. and Aplectana sp., had a similar prevalence (5.71%), but the former presented a higher mean intensity of infestation and mean abundance. The behavior and food habits of amphibians are responsible for the differences in their helminthofauna, and this study presents four new records of nematodes in H. albopunctatus.
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)