Under the conditions of the present study it was concluded that REE had no
positive effects on the performance of fattening bulls. The supplementation of
REE resulted in a decrease in feed intake and therefore a lower live weight gain.
Conversely, results in the literature suggested that a restricted feed intake possibly
entailed an improvement in the digestibility of nutrients. Therefore, further
research is necessary to examine the mode of action of REE in the digestive tract
of ruminants.