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Avaliou-se a resistência do fungo nematófago Monacrosporium sinense (isolado SF 470) em passar pelo trato gastrintestinal de bovinos e testou-se sua capacidade predatória sobre larvas infectantes de tricostrongilídeos após a passagem. Cem gramas de péletes formulados em matriz de alginato de sódio do isolado fúngico de M. sinense foram administrados, por via oral (VO), a dois bezerros mestiços holandês×zebu de seis meses de idade. Para o controle utilizaram-se dois outros animais, de igual padrão, aos quais foram administrados 100g de péletes, VO, livre do isolado fúngico. Amostras fecais, coletadas nos tempos de 12h, 18h, 24h, 48h, 72h e 96h após os tratamentos, foram acondicionadas em placas de Petri e em coproculturas a 25ºC por 15 dias. Houve redução (P<0,05) no número de larvas infectantes de Cooperia spp. e Haemonchus spp. nos animais tratados em relação ao grupo-controle. A diferença ao final do experimento foi de 69,9% nas placas e 61,3% nas coproculturas. O fungo M. sinense demonstrou ser efetivo no controle de larvas infectantes de Cooperia spp e Haemonchus spp em condições de laboratório. This study aimed to evaluate the viability of the predatory fungi Monacrosporium sinense (SF 470 isolate) to prey infective trichostrongylids larvae of cattle after the test of passage through the gastrointestinal tract. One hundred grams of pellets with the isolate of M. sinense were orally administered to two six-month-old holstein×zebu crossbred calves. Two similar animals that orally received 100g of pellets without the fungal isolate were used as control. Fecal samples collected at 12, 18, 24, 48, 72 and 96 hours after the treatments were allocated in Petri dishes and in fecal cultures and incubated for 15 days at 25ºC. There was significant reduction (P<0.05) of the average number of infective larvae of Cooperia spp. and Haemonchus spp. in the animals treated with the fungus when compared to the control calves. At the end of the experiment, the differences were 69.9% in the Petri dishes and 61.3% in the fecal cultures. The fungi M. sinense was effective in the control of infective gastrointestinal trichostrongylids larvae of cattle in laboratory conditions

Controle biológico de tricostrongilídeos (Nematoda: Trichostrongyloidea) gastrintestinais de bovinos pelo fungo Monacrosporium sinense