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O ivermectin, antiparasitário amplamente utilizado em caprinos jovens, foi avaliado sobre nematódeos gastrintestinais, em todas as fases parasitárias. Doze caprinos jovens, naturalmente parasitados foram utilizados no experimento, sendo um grupo de seis animais medicado com ivermectin, na dose de 200µg.kg-1 v.o. e o outro grupo utilizado como controle. Para a avaliação, utilizou-se o teste de redução na contagem de ovos (FECR), redução de larvas infectantes e carga parasitária. Amostras fecais de caprinos foram coletadas no dia da medicação (dia zero), aos sete e catorze dias. No décimo quarto dia pós-medicação, todos os caprinos foram sacrificados, para a coleta de helmintos e cálculo da carga parasitária total. A redução do número de ovos (FECR) e a eficácia sobre adultos foi de 42,10 % e 32,62 %, respectivamente.O gênero Haemonchus representou 100 % da população do grupo medicado e 99,58 % do grupo controle. Estes resultados indicam que os caprinos já estavam parasitados por Haemonchus resistente ao ivermectin. Ivermectin, an antiparasitic drug that is widely used in young goats, was avalied as to its effect on gastrointestinal nematodes, at all parasitic stages. Twelve naturally infected young goats was studied: six of them received 200µg.kg-1 of ivermectin orally, while the other six was used as controls. The faecal egg count reduction (FECR) test, the larval culture and the worm burden was estimated. Faecal samples was collected from the goats on the day of medication (day zero), at seven and at fourteen days. All the goats were killed fourteen days after treatment; helminths were collected and the total parasite load was estimated. FECR and the efficiency of the drug on adult nematodes was 42.10% and 32.62%, respectively. The genus Haemonchus represented 100% of the population in the treated group and 99.58% of the control group. These results show that the goats had already been infected by ivermectin-resistant Haemonchus strains

Haemonchus resistente a lactona macrocíclica em caprinos naturalmente parasitados