Effects of lysine and methionine supplementation on growth, body composition and digestive function of grass carp (Ctenopharyngodon idella) fed plant protein diets using high-level canola meal

生物 草鱼 淀粉酶 动物科学 肝胰腺 蛋氨酸 饲料转化率 油菜 餐食 鱼粉 豆粕 作文(语言) 脂肪酶 食品科学 氨基酸 生物化学 内分泌学 体重 渔业 生态学 原材料 哲学 语言学
作者
Jun Jiang,Da Shi,Xiao‐Qiu Zhou,Lin Feng,Y. Liu,Wei‐Dan Jiang,Pei Wu,Ling Tang,Yushi Wang,Yan Zhao
出处
期刊:Aquaculture Nutrition [Wiley]
卷期号:22 (5): 1126-1133 被引量:32
标识
DOI:10.1111/anu.12339
摘要

A 76-day feeding trial was carried out to evaluate the effects of Lysine and Methionine supplementation on growth and digestive capacity of grass carp (Ctenopharyngodon idella) fed plant protein diets using high-level canola meal (CM). Fish with initial average weight 103.9 ± 0.6 g were fed three extruded diets. Fish meal (FM) diet was formulated as the normal control with 40 g kg−1 FM and 300 g kg−1 CM; CM diet was prepared by replacing all FM with CM (total 340 g kg−1) without Lys or Met supplementation; CM supplement (CMS) diet was similar to CM diet but was supplemented with essential amino acids (EAA) to ensure the levels of Lys and Met similar to those in the FM diet. Feed intake, feed efficiency and specific growth rate of the grass carp fed CMS and FM diets were similar (P > 0.05), but higher than those of the grass carp fed CM diet (P < 0.05). The hepatosomatic index, relative gut length, intestosomatic index and intestinal folds height were significantly improved in fish fed FM and CMS diets as compared to CM diet (P < 0.05). Lower activities of trypsin, lipase and amylase in hepatopancreas were observed in fish fed CM diet (P < 0.05). Three hundred and forty gram per kilogram CM without Lys or Met supplementation significantly decreased trypsin, lipase and amylase mRNA levels in hepatopancreas (P < 0.05). These results indicated that the high supply of CM (340 g kg−1) in plant protein (200 g kg−1 soybean meal and 100 g kg−1 cottonseed meal) diets decreased digestive ability through decreasing digestive enzyme activities and enzyme gene's expressions of grass carp, and these side effects can be reversed by supplementing Lys and Met. Therefore, CM could be high level used in a plant protein blend-based extruded diet for grass carp as long as EAA were supplemented.
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