Moreover, the decrease in growth performance at inclusion evels of canola meal of 20% and higher was most likely due to the presence of glucosinolates, tannins, and sinapine, antinutritional factors present in canola. Tannins might not only give a meal a dark unattractive color, but also form complexes with protein and proteolytic
enzymes in the gastrointestinal tract, thereby negatively affecting protein digestion and growth performance