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Background  Tannin-rich plants have been examined as an alternative for controlling the gastrointestinal nematodes in ruminants.  In vivo  assays typically examine the anthelmintic activity in female fecundity and/or the adult worm burden, without considering other life-cycle stages or the impact on pasture contamination. The aim of the present study was to evaluate the anthelmintic activity of tanniniferous food from  Bauhinia pulchella  in goats and the potential impact on pasture contamination with the infective larval stage of gastrointestinal nematodes.    Findings  Sixteen cross breed Boer goats that were naturally infected with gastrointestinal nematodes were fed tanniniferous concentrate from the leaves of  B. pulchella  and compared to a separate paddock of control animals without condensed tannin supplementation. A range of parasite characteristics were monitored throughout the 63 days of experimentation, including faecal egg count (FEC), egg hatching and relative numbers of hatched helminth larvae on herbage. Worm free tracer animals were used to assess the infective larval stage load of the contaminated pasture. The tanniniferous food did not reduce the combined FEC values, but egg hatching was significantly affected ( p  < 0.05). The pasture grazed by goats fed with tanniniferous food from  B. pulchella  showed reduced contamination through infective larval stages. Tracer goats maintained in paddocks grazed with animals fed with tanniniferous food had lower numbers of  Trichostrongylus colubriformis  than did those in the control group (86 % reduction).    Conclusions  Condensed tannin from  B. pulchella  showed anthelmintic activity, affected egg viability and reduced pasture contamination, which led to the reduced infection of the animals by  T. colubriformis .

Effect of tanniniferous food from Bauhinia pulchella on pasture contamination with gastrointestinal nematodes from goats