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Recent surveys have identified anthelmintic effects from many bioactive substances particularly from condensed tannin (CT) sources. The aims of the present study were to investigate the potential anthelmintic effects of condensed tannins (CT) on Trichostrongylus colubriformis in experimentally infected sheep and the nutritional consequences on animals. Twenty helminth-free lambs were divided into five groups of four animals. Groups I to IV were artificially infected with 6,000 third stage larvae (L3) of T. colubriformis. Group I was the infected control and group V was the uninfected control. Twenty-eight days post-infection (p. i.) lambs from GII were supplemented with tanniniferous sorghum (350 g/animal/day, during seven days); GIII were drenched with Acacia mearnsii extract (15% CT) for just one day and GIV during two days (1.6 g extract/kg BW). At day 36 p. i., animals from infected group (GI to GIV) were slaughtered. Faecal egg counts (FEC) values present a reduction on GII when compared with GI at day 29 p. i. (P < 0.05) and between GIII and GI at day 35 and 36 p.i. (P < 0.05). The values of egg hatchability and number of L3 recovered from the faeces were not statistical analyzed (there was no duplicate data), however there was a considerable reduction between the values from treated and control group. The use of CT on diet did not cause significant difference on blood parameters, body-weight and carcass-weight (P > 0.05). No difference was related on total worm burden between treatments; however, GIV presented lower number of females than GI (P < 0.05). The use of CT could be a promising alternative source to reduce the pasture contamination and to control T. colubriformis infection in sheep.<p><p>O objetivo principal deste trabalho foi avaliar o potencial efeito anti-helmíntico dos taninos condensados sobre Trichostrongylus colubriformis em ovinos experimentalmente infectados e as conseqüências nutricionais destes produtos sobre os animais. Vinte ovinos livres de infecção parasitária foram divididos em cinco grupos de quatro animais. Os grupos GI a GIV foram experimentalmente infectados com 6000 larvas infectantes (L3) de T. colubriformis. O GI foi mantido como controle infectado e o GV como controle não infectado. Vinte e oito dias pós-infecção (p.i.) os animais foram tratados com fontes de taninos condensados (TC): o GII suplementado com 350 g de sorgo taninífero, durante sete dias; os grupos GIII e GIV receberam extrato de Acacia mearnsii (1,6 g de extrato/kg de peso vivo), durante um ou dois dias, respectivamente. No 36º dia p.i. os animais dos grupos I a IV foram abatidos. No dia 29 p.i. (2º dia de tratamento) foi detectada diferença significativa no número de ovos por grama de fezes (P < 0,05) entre o GII e GI; já no 35º e 36º dias p.i. houve diferença (P < 0,05) entre os grupos GIII e GI, com menor número de ovos no grupo tratado com TC. A carga parasitária total dos grupos foi semelhante, porém houve diferença significativa no número de fêmeas do GIV em relação ao GI (P < 0,05). Não houve alteração no peso corporal e nos parâmetros hematimétricos dos animais tratados com fontes de TC (P > 0,05). O uso dos TC pode ser promissor no controle de T. colubriformis em ovinos

Anthelmintic effects of condensed tannins on Trichostrongylus colubriformis in experimentally infected sheep