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Effects of dietary coated protease on growth performance, feed utilization, nutrient apparent digestibility, intestinal and hepatopancreas structure in juvenile Gibel carp (Carassius auratus gibelio)

文献类型： 外文期刊

作者： Liu, W. 1 ; Wu, J. P. 1 ; Li, Z. 3 ; Duan, Z. Y. 3 ; Wen, H. 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Key Lab Freshwater Biodivers Conservat, Minist Agr, Yangtze River Fisheries Res Inst, Wuhan, Hubei, Peoples R China

2.Huazhong Agr Univ, Coll Fisheries, Wuhan, Hubei, Peoples R China

3.Kemin Ind Zhuhai Co Ltd, Zhuhai, Guangdong, Peoples R China

关键词： Carassius auratus gibelio;feed utilization;growth performance;intestinal and hepatopancreas structure;nutrient apparent digestibility;protease

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

ISSN： 1353-5773

年卷期： 2018 年 24 卷 1 期

页码：

收录情况： SCI

摘要： This study was conducted to investigate the effects of dietary protease on growth performance, feed utilization, whole-body proximate composition, nutrient digestibility, intestinal and hepatopancreas structure of juvenile Gibel carp, Carassius auratus gibelio (mean weight 8.08 +/- 0.18g). Six diets were prepared, including a positive control diet (dietary protein 350g/kg, PC), one negative control diet (dietary protein 33g/kg, NC) and four protease supplementations diets, which were 75, 150, 300 and 600mg/kg protease NC diet. After 12weeks of diet feeding in indoor recycle aquarium tanks, no significant difference (p>.05) was found on growth performance between fish fed diet with 75-600mg/kg protease and the PC group. Compared with the fish fed the NC diet, the specific growth rate of fish fed 300mg/kg protease increased significantly (p<.05), as well as protein efficiency ratios (p<.05), while feed conversion was the opposite (p<.05). The nutrient digestibility of crude protein and lipid was higher (p<.05) in fish fed 150mg/kg protease diet than the PC diet. Whole-body proximate composition of fish was not affected (p>.05) by the dietary treatment. Serum alkaline phosphatase and albumin were significantly affected by dietary protease (p<.05), while the content of total protein, glucose, triglyceride, total cholesterol, aspartate aminotransferase and alanine aminotransferase activities in serum was not affected (p>.05). Foregut muscular thickness was thinner (p<.05), when the fish fed diets supplementation of protease in 150 or 600mg/kg diet than the NC diet. Protease activities in hepatopancreas and foregut were higher (p<.05), in the fish fed 150 or 300mg/kg protease diet than the fish fed the PC diet, but those in the mid- and hindgut were not significantly affected (p>.05) by the dietary treatments. Based on the regression analysis of weight gain rate, the optimal dietary inclusion level of protease was 400mg/kg in the diet for juvenile Carassius auratus gibelio.

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