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A viabilidade de uma formulação do fungo Monacrosporium sinense foi avaliada no controle de nematóides parasitos gastrintestinais de bovinos. Dois grupos de 10 bezerros cada um, mestiços Holandês x Zebu, de seis a nove meses de idade, foram colocados em pastagem de Brachiaria brizantha. Em um dos grupos, cada animal recebeu 20g de péletes em matriz de alginato de sódio, contendo massa miceliana do fungo M. sinense via oral, duas vezes por semana, durante seis meses, com início no mês de outubro; no outro grupo, controle, os bezerros não receberam esse tratamento. As contagens de ovos por grama de fezes (OPG) e de larvas infectantes por kg de matéria seca foram maiores (P<0,05) no grupo-controle, e a diferença entre o OPG dos dois grupos, no final do experimento, foi de 79%. A viabilidade dos péletes em germinar e a atividade predatória do fungo após o encapsulamento foram avaliadas in vitro. A porcentagem de péletes com cultivo positivo para o fungo variou entre 90 e 100%, e o percentual de redução de larvas infectantes in vitro variou entre 90,6 e 100%. A aplicação de péletes de M. sinense na dosagem e periodicidade usadas são eficazes no biocontrole de nematóides parasitos gastrintestinais de bovinos. The viability of a formulation of the fungus Monacrosporium sinense was evaluated as control of bovine gastrointestinal nematodes parasites. Two groups were used and they were made up of 10 Holstein X Zebu crossbred, six to eight-month-old. They were grazing on Brachiaria brizantha pasture. In the treated group, each animal received orally, twice a week 20g of pellets of sodium alginate containing mycelial of the fungus M. sinense, during six months, with the onset in October. In the control group, the calves did not receive that treatment. The counting of eggs per gram of faeces (EPG) and the counting of infective larvae per kg of dry matter were higher (P<0.05) in the control group than in the treated group. The difference of the EPG between the groups at the end of the experimental period was 79%. The viability of the pellets germination and the predatory activity of the fungus after the encapsulation were evaluated in vitro. The percentage of pellets with positive culture for fungus varied between 90-100% and the percentage of reduction of infective larvae varied between 90.6-100%. The use of that dose and the periodic application of M. sinense pellets were efficient as control of bovine gastrointestinal nematode parasites

arquivo brasileiro de medicina veterinária e zootecnia/arquivo brasileiro de medicina veterinária e zootecnia

Viabilidade de formulação peletizada do fungo nematófago Monacrosporium sinense, no controle biológico de nematóides parasitos gastrintestinais de bezerros