EN
The field experiments were carried out in 19941996 and were aimed at determining the nutritional value of mixtures containing Trifolium pratense L. + Lolium perenne L., Lolium multiflorum Lam., Lolium multiflorum Lam. var. westerwoldicum and Lolium x boucheanum Kunth. and Trifolium pratense L. + Festuca pratensis Huds.. Based on the botanical analysis, chemical composition and nutritional value, an attempt has been made to determine the variability of the parameters depending on the grass species. The percentages of grasses varied significantly and the variability expressed in the coefficient of variance ranged from 44 to 72.