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Dietary chromium polynicotinate enhanced growth performance, feed utilization, and resistance to Cryptocaryon irritans in juvenile large yellow croaker (Larmichthys crocea)

文献类型： 外文期刊

作者： Wang, Jun 1 ; Ai, Qinghui 1 ; Mai, Kangsen 1 ; Xu, Houguo 1 ; Zuo, Rantao 1 ;

作者机构： 1.Ocean Univ China, Key Lab Mariculture, Minist Educ, Qingdao 266003, Peoples R China

2.CAFS, South China Sea Fisheries Res Inst, Minist Agr, Key Lab Aquat Prod Proc, Guangzhou 510300, Guangdong, Peoples R China

关键词： Feeding and nutrition;Starch;Chromium polynicotinate;Large yellow croaker;Larmichthys crocea

期刊名称：AQUACULTURE （ 影响因子：4.242； 五年影响因子：4.723 ）

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收录情况： SCI

摘要： A feeding trial was conducted to determine the effects of dietary chromium polynicotinate (Cr-Nic) on growth, feed utilization, and resistance to Cryptocmyon irritans in juvenile large yellow croaker (Larimichthys crocea). Six diets containing 42% crude protein and graded levels of Cr-Nic (0, 5, 10, 20, 40 and 80 mg kg(-1) diet) were fed to croaker juveniles initially averaging 8.74 0.48 g for 10 weeks. Another diet containing 45% crude protein without Cr-Nic supplementation was also fed and served as a control. Wheat starch was used as the carbohydrate source for all of the experimental diets. Fish fed the diet supplemented with 5 mg kg(-1) Cr-Nic had significantly higher rates of survival, specific growth rate (SGR), feed efficiency (FE), and protein efficiency ratio (PER), but lower feed intake than fish fed diets with 0 and 80 mg kg(-1) Cr-Nic. Fish fed the diet containing 5 mg kg(-1) CrNic had significantly higher SGR and PER than fish fed the 45% crude protein control diet Analysis of SGR, FE, and PER by second-order regression indicated that the optimal dietary level of Cr-Nic for juvenile large yellow croaker was estimated to be 6.70-7.10 mg kg(-1) of diet. The 3-week cumulative mortality rate following natural infection of the parasite C irritans was lowest in fish fed the diet containing 5 mg kg(-1\) Cr-Nic, which was significantly lower than in fish fed the diet without Cr-Nic addition. It is suggested that Cr-Nic supplementation protects against C. irritans infection prior to parasitic outbreak to alleviate mortality

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