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
第一作者: Wang, Jun
作者: Wang, Jun;Ai, Qinghui;Mai, Kangsen;Xu, Houguo;Zuo, Rantao;Wang, Jun
作者机构:
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
分类号: S9
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