Effect of low molecular weight fish protein hydrolysate on growth performance and IGF-I expression in Japanese flounder (Paralichthys olivaceus) fed high plant protein diets
文献类型： 外文期刊
作者： Zheng, K. 1 ; Xu, T. 1 ; Qian, C. 2 ; Liang, M. 1 ; Wang, X. 1 ;
作者机构： 1.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Qingdao 266071, Shandong, Peoples R China
2.Sun Yat Sen Univ, Guangzhou 510275, Guangdong, Peoples R China
期刊名称：AQUACULTURE NUTRITION （ 影响因子：3.497； 五年影响因子：3.78 ）
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收录情况： SCI
摘要： Seven isonitrogenous and isoenergetic experimental diets were formulated to investigate the effect of low molecular weight fish protein hydrolysate (FPH) in diets on growth performance, feed utilization and liver IGF-I mRNA levels in Japanese flounder (38.80 +/- 1.11 g) fed with high plant protein diets. Fish meal protein was, respectively, replaced by 6% (FPH6), 11% (FPH11), 16% (FPH16), 21% (FPH21), 26% (FPH26) FPH of total dietary protein. FPH diets contained a constant high level of plant protein (690 g kg(-1)) from soybean meal. As a positive control diet, FM2 contained about 590 g kg(-1) plant protein and 410 g kg(-1) fish meal protein, while negative control diet FM1 contained about 690 g kg(-1) plant protein and 310 g kg(-1) fish meal protein. The expression levels of liver IGF-I mRNA were evaluated using real-time PCR normalized against the 18S rRNA gene. The results showed that moderate low molecular weight FPH (FPH11) improved growth performance and protein retention. Fish fed with FPH11 and control diet FM2 had similar growth and feed utilization, while high-level low molecular weight FPH did not improve growth performance and protein retention, and depressed liver IGF-I mRNA expression in Japanese flounder.
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