AbstractTanniferous forage plants can have beneficial effects on ruminant productivity and health (improved protein supply, bloat safety and antiparasitic properties). However, condensed tannins can also lower palatability, voluntary feed intake and digestibility. The aim of our interdisciplinary project was to generate basic knowledge on plant management, feed palatability and the antiparasitic properties of tanniferous forage plants for their practical application in agronomy, focusing on their usefulness in controlling gastrointestinal nematodes in organic farming. We found thatOnobrychis viciifolia(sainfoin),Lotus corniculatus(birdsfoot trefoil) andCichorium intybus(chicory) were suitable for cultivation under the given temperate climatic conditions, whereasLotus pedunculatus(big trefoil) was soon outcompeted by unsown species. Growing the tanniferous plant species in a mixture withFestuca pratensis(meadow fescue) rather than in a monoculture had the advantage of increasing total dry matter (DM) yield (especially in the case of tanniferous legumes) and of reducing the DM proportions of unsown species. However, due to dilution by non-tanniferousF. pratensis, the tannin concentrations of mixtures were clearly lower and the seasonal fluctuations in tannin concentrations greater than that of monocultures. Across species, tannin concentrations were highest forO. viciifolia, followed byL. corniculatusand very low forC. intybus. Palatability of all tanniferous forages was comparable to that of a ryegrass/clover mixture when fed as dried forage and, when offered as silage, palatability ofO. viciifoliawas clearly superior to that of the respective ryegrass/clover control. Administration of dried or ensiledO. viciifoliareduced parasite egg counts in feces of lambs co-infected with the gastrointestinal nematode speciesHaemonchus contortusandCooperia curticei. We conclude thatO. viciifoliais the most promising among the tested tanniferous forage plant species due to its suitability for cultivation, its high tannin concentration, its high palatability and its antiparasitic activity even in dried or ensiled form.