Avaliação da interação entre os isolados fúngicos Duddingtonia flagrans, Monacrosporium thaumasium e Arthrobotrys robusta no controle biológico de nematóides gastrintestinais de bovinos leiteiros a campo

• Autor(a) principal: Luns, Fábio Dias
• Data de Publicação: 2013
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/5156
• topic: Controle biológico; Nematóides; Bovinos; Biological control; Nematodes; Cattle; CNPQ::CIENCIAS AGRARIAS::MEDICINA VETERINARIA

The gastrointestinal parasitism by nematodes is a relevant problem in cattle around the world. Biological control of nematodes with nematophagous fungi is an effective alternative for the control of parasitic diseases of cattle in the field. The aim of this study was to evaluate the interaction between nematophagous fungi Duddingtonia flagrans (AC001), Monacrosporium thaumasium (NF34A) and Arthrobotrys robusta (I31) in the control of gastrointestinal nematodes in cattle under field conditions. Forty heifers Girolando females, aged between six and 12 old-months were divided into five groups of 08 animals for a period of six months and each group received the following treatments: Group 1: 1g/10 kg body weight (b.w.) of pellets sodium alginate (0.2 g of fungus/ 10 kg b.w.) containing fungi D. flagrans and M. thaumasium twice a week, Group 2: 1g/10 kg b.w. of pellets containing fungi D. flagrans and A. robusta, twice a week, Group 3: 1g/10 kg b.w. of pellets containing fungi M. thaumasium, A. robusta and D. flagrans, Group 4: negative control, untreated; and Group 5: positive control: 1g/10 kg b.w. of pellets containing the fungus D. flagrans only. The EPG reduction percentages obtained in this study were 78% (Group 1), 78% (group 2), 80% (Group 3) and 73% (Control +). In the last month of the study, there was a reduction of 67% (Group 1), 74% (Group 2), 70% (Group 3) and 74% (Control +). There was no significant difference in EPG between the groups treated with association by two fungal isolates (G1 and G2), three fungal isolates (G3) and the group treated with pellets of D. flagrans only (p>0.05). It was concluded that there was no synergy between the fungal isolates M. thaumasium (NF34A), A. robusta (I31) and D. flagrans (AC001) when used in associated on the formulation of pellets sodium alginate to control nematodes of dairy cattle in the field.