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Cooperia , Haemonchus and Oesophagostomum are the genera of gastrointestinal parasitic nematodes most prevalent in cattle and constitute a serious problem in cattle breeding due to the impact they have on meat and milk production and the high costs of control measures. The objective of the present work was to evaluate the efficiency of Bioverm ® ( Duddingtonia flagrans ) in the control of gastrointestinal parasitism of young cattle raised in the field, in the Central-West region of Brazil. The experiment was conducted on a farm located in the municipality of Jangada, MT, where 18 cattle, Nelore and Aberdeen Angus breeds, aged six to ten months, were randomly divided into two groups (treated group and control group) and distributed in paddocks of Brachiaria decumbens , naturally infested by larvae of gastrointestinal nematodes. The animals in the treated group received 1g of Bioverm ® for each 10 kg of body weight, administered daily with commercial feed, throughout a period of six months. In the control group, each animal received 1 g of rice bran for each 10 kg of body weight, without Bioverm ® , added to the feed. Stool and pasture samples were collected every two weeks. The treated group showed a significant reduction ( p &lt; 0.05) in values of eggs per gram of feces (EPG) and a significant gain of body weight ( p &lt; 0.05) when compared to the control group. The fungal formulation Bioverm ® was effective in pasture decontamination and consequently in reducing the occurrence of reinfection by nematodes. The animals treated with Bioverm ® showed a lower parasitic load and greater weight gain.

Bioverm® in the Control of Nematodes in Beef Cattle Raised in the Central-West Region of Brazil