Sheep farming is an activity of great importance in the country, it is based on the exploitation of meat, and wool. But facing a big problem in its expansion: the occurrence of verminosis in sheep herds. This disease causes serious economic damage. Because it decreases investment and increases mortality rates. Thus, for treatment, several classes of anti-helminthic are used. However, due to indiscriminate use, parasites develop resistance, making protocols ineffective. The aim of the study is to know the resistance anti-helminthine in sheep after the use of monepantel in lambs. In addition, to diagnose the situation of anti-helminthian resistance in these animals and quantify the parasitic load in different breeds and crosses. The study was conducted with 90 animals and administered monepantel (2,5 mg/kg, orally). The evaluation was performed in different breeds and crosses: G1 - Ile de France (n=12), G2 - Ile de France cross (n=12), G3 - Poll Dorset (n=4), G4 - Texel (n=4), G5 - Sulffolk (n=6), G6 – Suffolk cross (n=7), G7 - Santa Inês (n=11), G8 - Dorper x Santa Inês cross (n=4), G9 - Dorper cross (n=15) e G10 - White Dorper cross (n=15). Feces collection and egg count per gram of feces (EPG) were performed in two moments for evaluation: M1 – before administration of the drug and M2 – 14 days later. The maximum reduction in OPG count was 100% in the Texel breed and Dorper with Santa Inês cross. The Dorper cross was the lowest reduction in EPG count with 32.45%. Purebred sheep had lower number of EPG for Strongyloidea (M1 280,55 ± 536,526; M2 35,13 ± 105,97) compared to animals from crosses (M1 887,27 ± 1382,12; M2 407,27 ± 772,16). Parasitic resistance to monepantel was observed in eight of the ten breeds and crosses used in the study for Strongyloidea.
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