文献类型： 外文期刊

作者： Yang, Wenxiu ¹ ; Gu, Zhimin ³ ; Chen, Xiaoru ⁴ ; Gao, Weihua ² ; Wen, Hua ¹ ; Wu, Fan ¹ ; Tian, Juan ¹ ;

作者机构： 1.Chinese Acad Fishery Sci, Yangtze River Fisheries Res Inst, Wuhan 430223, Peoples R China

2.Yangtze Univ, Coll Anim Sci, Jingzhou 434024, Peoples R China

3.Minist Agr & Rural Affairs, Zhejiang Inst Freshwater Fisheries, Key Lab Hlth Freshwater Aquaculture,Minist Agr & R, Key Lab Freshwater Aquaculture Genet & Breeding Fr, Huzhou, Peoples R China

4.Tongwei Co Ltd, Hlth Aquaculture Key Lab Sichuan Prov, Chengdu, Peoples R China

关键词： Procambarus clarkii; Phytase; Growth; Calcium; Phosphorus; Digestion

期刊名称：FISH & SHELLFISH IMMUNOLOGY （ 影响因子：4.622； 五年影响因子：4.799 ）

ISSN： 1050-4648

年卷期： 2022 年 127 卷

页码：

收录情况： SCI

摘要： Fish meal is increasingly being replaced by plant protein raw materials, meanwhile, it brings phytic acid, which combines with phosphorus to form phytate phosphorus and leads to a low utilization rate of phosphorus in shrimp. To solve this problem, this study investigated the effects of phytase supplementation on growth per-formance, phosphorus utilization, antioxidants, and digestion in red swamp crayfish (Procambarus clarkii). Crayfish (initial mean weight: 8.69 +/- 0.15 g, N = 324) were randomly divided into six groups each with three replicates of 18 individuals each, and hand-fed for 8 weeks with one of six experimental diets (50 and 490 g kg(-1) animal and plant protein raw material, respectively): negative control (NC; 11.0 g kg(-1) phosphorus), positive control (PC; 15 g kg(-1) NaH2PO4 added to NC; 14.7 g kg(-1) phosphorus), and phytase supplementation diets (P1-P4: 0.1, 0.2, 0.4, and 0.6 g kg(-1) phytase added to NC, respectively). The feeding trial was performed in a micro-flow water culture system. P2 showed a significantly higher weight gain rate (WGR), specific growth rate, protein efficiency ratio, and protein retention efficiency (PRE) but showed the lowest feed conversion ratio (FCR) than other groups. Broken-line regression analyses using WGR, FCR, and PRE as evaluation indices showed that the optimal dietary phytase supplementation level was 0.233, 0.244, and 0.303 g kg(-1), respectively. P2 showed the highest crude protein content of whole crayfish and abdominal muscle, and phosphorus deposition rate, which was significantly higher than that in NC and PC. P3 showed the highest calcium and phosphorus contents in whole crayfish and phosphorus content in abdominal muscle, and calcium and inorganic phosphorus content in serum, which were significantly higher than those in NC. P3 showed significantly lowest serum alkaline phosphatase, alanine aminotransferase, aspartate transaminase activities, malondialdehyde content in hepato-pancreas, and highest catalase activity, which were significantly lower and higher, respectively, than those in NC and PC. In summary, the addition of 0.2-0.4 g kg(-1) phytase significantly improves the growth performance, feed utilization, digestive enzyme activity, and antioxidant of P. clarkii, which has a similar effect to the direct addition of NaH2PO4 at 15 g kg(-1) to the feed.