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Effects of dietary cecropin on growth, non-specific immunity and disease resistance of tilapia (Oreochromis niloticusxO.aureus)

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文献类型：外文期刊

作者： Lin, Xin ¹ ; Chen, Wenyan ¹ ; Lin, Shimei ¹ ; Luo, Lin ³ ;

作者机构： 1.Southwest Univ, Coll Anim Sci & Technol, Chongqing 400716, Peoples R China

2.Southwest Univ, Key Lab Freshwater Fish Reprod & Dev, Minist Educ, Chongqing 400716, Peoples R China

3.Beijing Fisheries Res Inst, Fish Dis Lab, Beijing, Peoples R China

关键词： cecropin;growth;non-specific immu nity;disease resistance;Oreochromis niloticusxO;aureus

期刊名称：AQUACULTURE RESEARCH （影响因子：2.082；五年影响因子：2.415 ）

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收录情况： SCI

摘要： An 8-week feeding trial was conducted to evaluate the effect of dietary cecropin on growth performance, non-specific immunity and disease resistance of hybrid tilapia (Oreochromis niloticusxO.aureus). A basal diet was supplemented with 0 (control), 75, 150 and 225mgkg(-1) cecropin to formulate four experimental diets. The results showed that final body weight and specific growth rate obtained with diet 150mgkg(-1) cecropin were significantly higher (P<0.05) than that obtained with diets 0 and 75mgkg(-1), whereas there was no difference between 150 and 225mgkg(-1). Feed conversion efficiency was improved by increasing the dietary cecropin content (P<0.05). However, feeding intake was reduced as dietary cecropin increased. Serum lysozyme, alkaline phosphatase, catalase and superoxide dismutase activity were significantly increased with the increased levels of dietary cecropin (P<0.05), and reached a maximum at level of 150mgkg(-1) cecropin, then those values no longer increased. Moreover, the dietary cecropin supplementation level also exhibited a decrease in the cumulative mortality rates compared with the controls when challenged with Aeromonas veronii. The results suggested that the dietary supplementation of cecropin could improve the growth, non-specific immunity indicators and resistance of hybrid tilapia against A.veronii.

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