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SUMMARY This study aimed to evaluate the effect of Ivermectine 0.08% and Levamisole Hydrochloride 5% in controlling sheep and goat gastrointestinal helminthiasis from Agreste region of Paraiba State, Northeastern Brazil. The experiment was conducted from July 2011 to February 2012 with animals of both sexes from 28 farms, aged from three to 48 months. Eighteen animals without any anthelmintic treatment for at least three months were chosen from each farm. The animals were divided into three groups: group 1, treated with Ivermectine 0.08%, orally, in a single dose of 2.5 mL/ 10 kg l. w.; group 2, treated with Levamisole Hydrochloride 5%, orally, in a single dose 1.0 mL/ 10 kg l. w. and group 3, which received no anthelmintic treatment, serving as a control group. Fecal samples were collected on zero and ten days after treatments for fecal analysis. The treatment with Levamisole Hydrochloride reduced the parasite load of goats and sheep by 86.7% and 93%, respectively, while the treatment with Ivermectine, reduced the load only by 30.9% in goats and 24.6% in sheep. The most prevalent helminth species was Haemonchus spp . The gastrointestinal nematodes of goats and sheep from Agreste of Paraiba State are highly resistant to Ivermectine. Levamisole Hydrochloride is still effective in sheep, but already shows resistance traces in goats.

ars veterinária

ANTHELMINTIC RESISTANCE IN SMALL RUMINANTS FROM THE SEMIARID OF PARAÍBA STATE, BRAZIL/Resistência anti-helmíntica em pequenos ruminantes do semiárido da Paraíba, Brasil