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

用植物蛋白成分取代鱼粉会受到几乎所有蔬菜成分中存在的抗营养因子的阻碍。菜籽粕尤其有问题，因为它含有许多有害的抗营养因子，包括皂苷、单宁、植酸盐、硫代葡萄糖苷和不溶纤维。提高菜籽粕饲用价值的努力主要集中在油菜籽浓缩蛋白的生产上。尽管浓缩油菜籽蛋白的抗营养因子水平明显低于油菜籽粕，但由于生产成本较高，作为水产饲料的一种成分在经济上是不可行的。降低ANF水平的另一种更经济的方法可能是酵母发酵和/或酶预处理。以往的研究已报道，投喂发酵菜籽粉的鱼的生长性能明显好于投喂常规菜籽粉的鱼。 本研究旨在研究酵母发酵CM配合添加酶预处理对虹鱼和尼罗罗非鱼营养物质消化率和生长性能的影响。

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. This proposal aims to examine the effects of feeding yeast-fermented CM combined with supplemented enzyme pretreatment on the nutrient digestibility and growth performance of rainbow trout and Nile tilapia.