Dalsgaard et al. (2012) did an additional studywith rainbowtrout in
which independent diets with high inclusion levels of three different
plant-based feedstuffs (soybean [344 g kg−1], sunflower [246 g kg−1]
and rapeseed [264 g kg−1]) meals were supplemented with three different
enzymes (β-glucanase [67 mg kg−1], xylanase [208 mg kg−1]
and protease [228 mg kg−1]) and apparent nutrient digestibility was
assessed.