Roundup Ready' (RR) sugar and fodder beets have been developed, which can tolerate Roundup' (glyphosate) herbicide treatment due to production of the 5-enolpyruvylshikimate-3-phosphate synthase protein (CP4 EPSPS) from Agrobacterium sp. strain CP4. The purpose of these experiments was to examine whether RR sugar and fodder beets or pulp derived from RR sugar beets were comparable to conventional (C) beets a& pulps with respect to nutrient digestibility. Six varieties of sugar beets (SC-I-lRR), 5 varieties of fodder beets (IC-+lRR) and 6 varieties of beet pulp (5C+lRR) were tested in 3 digestibility experiments with 7 sheep on each treatment. The daily dry matter intake was approx. 950 g (maintenance level), where hay with known digestibility and urea (assumed to be 100% digestible) was included in the diet in all experiments to obtain sufficient nitrogen and structural fiber. The digestibility was estimated for nutrients analyzed according to the Weende analysis, and for ADF, NDF and energy. The digestibility of organic matter varied between 91.8 and 94.6% for fodder beets, where RR variety showed the lowest value. For the sugar beets the variation was between 94.3 and 96.6%. with the RR variety resulting in a value of 94.4%. No significant difference was obtained between C or RR varieties for the main nutrients or energy in the sugar beet or fodder beet experiment. Organic matter digestibility for beet pulp varied between 84.7 and 89.5%: where the RR variety resulted in a value of 85.5%, and significant differences were found for main nutrients and energy digestibility between the highest and lowest C varieties. Organic matter digestibilities obtained for beets were slightly higher and for pulp slightly lower than tabulated values. From these experiments it is concluded that RR sugar and fodder beets, or pulp derived from RR sugar beets, have a nutrient digestibility which is within the range observed for conventional beets and pulps, indicating that feeding value is not influenced by genetic modification.