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The purpose of this research was to test the main anthelmintic drugs, such as Avermectins, Benzimidazoles, Imidazothiazoles, Tetrahydropyrimidines and Salicylanilides, used for the control of gastrointestinal nematodes in bovines on cattle ranches in the semiarid region of the state of Paraiba, Brazil. This study involved 40 animals per ranch, making a total of 200 animals of mixed breeds, varying in age from 12 to 36 months, with eggs per gram of faeces (EPG) >500. The anthelmintics were administered to the animals on day zero in a single dose, following the manufacturers' instructions. To determine the Fecal Egg-Count Reduction Test (RFEG), fecal samples were collected directly from the rectum on day zero and fourteen days after the beginning of the experiment. Among the various tested drugs, only Doramectin exhibited efficient performance (95.5%), surpassing that of ivermectin (81.5%). The results achieved with the other drugs were considered insufficient, since their efficiency was lower than 80%. The highest parasitic load was presented by the genus Haemonchus spp., with an average of 87%+/- 0.06 on day zero and 90 +/- 0.04% after 14 days.

Multiple resistances of gastrointestinal nematodes to anthelmintic groups in cattle of semiarid of Paraíba, Brazil