The concentrate intake was slightly stimu-lated 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 explainedwith the reduced 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 declined 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).