The feeding of heather (Calluna vulgaris) to Teladorsagia circumcincta infected lambs reduces parasitism but can detrimentally impact performance von Shepherd, F., Houdijk, J.G.M., Chylinski, C., Hutchings, M.R., Kelly, R.F., Macrae, A., Maurer, V., Salminen, J.-P., Engström, M.T., Athanasiadou, S.

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