Effect of yeast-fermentation and extrusion of canola meal on digestibility and growth performance of rainbow trout and Nile tilapia

用植物蛋白成分代替鱼粉受到几乎所有蔬菜成分中存在的抗营养因子的阻碍。卡诺拉粉是特别成问题的，因为它含有许多有害的抗营养因子，包括皂苷、单宁、植酸盐、芥子油苷和不溶性纤维。提高卡诺拉粗粉的饲用价值的尝试集中在卡诺拉蛋白浓缩物的生产上。尽管卡诺拉蛋白浓缩物的抗营养因子水平明显低于卡诺拉粗粉，但由于生产该产品的成本高，因此作为水产饲料的成分在经济上不可行。降低ANF水平的替代且更便宜的方法可以是用酵母发酵和/或酶预处理。先前的研究已经报道，饲喂发酵的油菜籽粉的鱼的生长性能显著优于饲喂常规油菜籽粉的鱼。

Replacing fishmeal with plant protein ingredients is hampered by the presence of antinutritional factors present in virtually all vegetable ingredients. Canola meal is particularly problematic since it contains many deleterious antinutritional factors including saponins, tannins, phytates, glucosinolates and insoluble fibre. Attempts to improve the feeding value of canola meal have concentrated on the production of canola protein concentrate. Although canola protein concentrate has significantly lower levels of antinutritional factors than canola meal, it is not economically viable as an ingredient in aquafeeds due to the high cost of manufacturing this product. An alternative and cheaper approach to reduce the level of ANFs may be fermentation with yeast and/or enzyme pretreatment. Previous studies have reported that the growth performance of fish fed fermented canola meal was significantly better than fish fed conventional canola meal.