duddingtonia flagrans: controle biológico de nematodeos de bovinos a campo duddingtonia flagrans: biological control of cattle nematodes in the field

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ID: 162570
2008
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Abstract
O controle biológico é um método para diminuir uma população pela utilização de antagonista natural. No presente estudo, testou-se a eficácia do fungo nematófago Duddingtonia flagrans no controle de nematódeos parasitos gastrintestinais de bovinos criados à campo no município de Júlio de Castilhos. Foram utilizados 20 bezerros, distribuídos igualmente em duas áreas formadas por pastagem nativa. O grupo A foi tratado com o fungo D. flagrans, cultivado em sorgo, numa concentração de 1x10(6)clamidósporos kg-1 de peso animal, misturados em ração de manutenção, diariamente, durante oito meses. O grupo B serviu como controle e não recebeu fungo, apenas ração. Foram coletadas amostras para contagem de ovos por grama de fezes (OPG) semanalmente. Mensalmente, foram realizadas coproculturas para identificar as espécies de larvas de nematódeos, a pesagem dos animais e a coleta de pasto para contagem das larvas na pastagem. Dados de temperatura e índice pluviométrico foram registrados diariamente. O OPG foi reduzido no grupo tratado, em média 56,8,% nos últimos três meses de experimento, variando entre 40,4 e 67,1% no grupo tratado (P<0,001). A coprocultura demonstrou que os principais nematódeos encontrados em ambos os grupos foram dos gêneros Cooperia e Haemonchus. A contagem de larvas na pastagem obteve um percentual de redução 77,1% no grupo tratado ao final do experimento (P<0,01). Pôde-se concluir com este estudo que o papel do fungo Duddingtonia flagrans, é, sem dúvida, importante, principalmente, na diminuição do OPG e na redução significativa de larvas na pastagem. Portanto, este fungo nematófago é uma ferramenta biológica eficaz para ser empregado em um controle integrado de nematódeos de bovinos criados a campo.
Biological control is an alternative method to reduce parasite's population by the use of natural antagonist. In the present study, efficacy of nematophagous fungus Duddingtonia flagrans was tested to control gastrointestinal nematodes parasites of cattle livestock in the field. Twenty calves were used, distributed equally in two distinct plots formed by native pasture. Group A was treated with D. flagrans fungus, cultivated in sorghum (1x10(6) clamidospores kg-1 body weight) mixed with maintenance ration, each day, during eight months. Group B served as a control and did not receive the fungus. Samples for faecal egg count (FEC), were collected each week. There were monthly counts in faecal cultures to identify the species of nematodes larvae, animals weight, blood collection to determine red cell counts and collection of pasture to larvae counting. Temperature and rainfall data were registered daily. The FEC reduced around 56.8% in the last three months of the experiment, with a variation between 40.4 and 67.1% in the treated group (P<0.001). The faecal cultures demonstrated that the main nematodes found in both the groups were Cooperia and Haemonchus. Larvae counting in the pasture showed a reduction percentage around 77.1% in treated group at the end of experiment (P<0.01). It could be concluded with this study, that Duddingtonia flagrans has an important role in the reduction of FEC and significant reduction of larvae in the pasture. Therefore, this nematophagous fungus is efficient as a biological tool to be used in an integrated nematodes control of bovine raised in the field.
Reference Key
jobim2008cinciaduddingtonia Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Marta Bañolas Jobim;Janio Morais Santurio;Mario Luiz De La Rue
Journal Trials
Year 2008
DOI
10.1590/S0103-84782008000800026
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782008000800026
Keywords
biological control bovinos cattleagricultureagriculture (general)

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