silageorofmorethan50%concentrateinTMR.Ithasbeen
shownthatgrowinglambscancopewithaslowroughage
proportionsastheequivalenceof2%strawinthedietdry
matter(DM; Weston,1974). IntheNordiccountries,the
foragepartofthedietmostoftenconsistsofgrasssilage,as
the favourableclimateconditionsenableproductionofgrass
silagesofhighdigestibility.