Response of gibel carp (Carassius auratus gibelio) to increasing levels of dietary lysine in zero fish meal diets

文献类型： 外文期刊

第一作者： Ji, Ke

作者： Ji, Ke;Ren, Mingchun;Ge, Xianping;He, Juyun;Liang, Hualiang;Ren, Mingchun;Ge, Xianping;Masagounder, Karthik

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关键词： gibel carp (Carassius auratus gibelio); growth performance; lysine; requirement; TOR signalling pathway; zero fish meal

期刊名称：AQUACULTURE NUTRITION （ 影响因子：3.497； 五年影响因子：3.78 ）

ISSN： 1353-5773

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收录情况： SCI

摘要： To investigate the response of gibel carp to dietary lysine levels in zero fish meal (FM) diets, 8 experimental diets were designed. Among them, diet 1 and diet 2 with 150 g/kg FM, methionine, lysine and threonine were supplemented in diet 2. Diet 3 was without FM but matched the amino acid profile of diet 2 except for lysine. Diets 4-8 were based on diet 3, with graded levels of lysine. After 8-week feeding trail, final body weight, weight gain (WG), specific growth rate, feed conversion ratio (FCR) and feed intake were significantly improved by diets 1-2 and 6-8 compared with diet 3. Plasma glucose, triglyceride, immunoglobulin G and aspartate aminotransferase levels in diets 4-8 were higher than those in diet 1. Apparent digestibility coefficients (ADCs) of protein, energy, methionine, lysine, valine, histidine and phenylalanine in diet 1 were significantly lower than those in diet 6. The highest ADC of isoleucine was found in diet 3. TOR, IGF-1, JAK3, STAT4, STAT6 and PepT2 mRNA levels were significantly increased with increasing dietary lysine up to a certain level in zero FM diet and lower than diets 1-2. Based on WG and FCR, the optimal lysine requirement of juvenile gibel carp was determined to be 24.4 g/kg and 24.2 g/kg (65.9 g/kg and 65.4 g/kg of dietary protein) in zero FM diet, respectively, using quadratic regression analysis.

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