The grass silage intake remained unaffected by the REE treatments, whereas the grass hay intake linearly decreased with increasing REE supplementation in the growing period (p =0.030). The concentrate intake was slightly stimulated due to REE supplementation (p =0.084) and showing a significant quadratic effect ( p =0.025). The total feed intake linearly declined ( p =0.042) in the growing period which can be explained with thereduced grass hay intake. In the fattening period the maize silage intake was significantly reduced by 10.7% in Group D compared to the control group and showed a significant linear decrease ( p =0.001). In addition, the bulls of Group D had a significantly lower concentrate intake ( p =0.034) in comparison to Group C. As a consequence of de- clined maize silage and concentrate intake, the total feed intake of Group D was significantly lower than those of Group A ( Table 3). However, over the whole feeding trial neither live weight gain nor the feed-to-gain ratio and the metabolisable energy-to-gain ration were significantly influenced by the REE treatment ( Table 3).