The aim of this study was to evaluate the anthelmintic activity of Melia azedarach grounded dry fruits, in lambs naturally infected with gastrointestinal nematodes. Twenty four (24) mixed-breed Ile de France x Corriedale, male lambs, aged 3 month, were separeted into three (3) groups of eight (8) animals: the first group was medicated with 5mg.Kg-1 of albendazole orally, in a single dose, the second group was m...