β-Glucanase had a positive
effect on energy retention of the fish in the soybean experiment, while
there were no effects on nitrogen retention or fish performance in any
of the three experiments. This was the third study in which no effects
of carbohydrase enzyme supplementation on rainbow trout growth
performance were observed (Farhangi and Carter, 2007; Ogunkoya
et al., 2006); although, in the case of this study, the feeding trial only
lasted 19 days.