Effects of Dietary Short Chain Fructo Oligosaccharides on Intestinal Microflora,Mortality and Growth Performance of Oreochromis aureus ♂×O.niloticus♀
Effects of Dietary Short Chain Fructo Oligosaccharides on Intestinal Microflora,Mortality and Growth Performance of Oreochromis aureus ♂×O.niloticus♀
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发表时间：
2007
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通讯作者：
Zhi-gang Zhou
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作者：
Zhi-gang Zhou
为研究饲料中添加95%的短链低聚果寡糖对罗非鱼(Oreochromis aurea♂×O.nilotica♀)肠道菌群、死亡率和生长性能的影响，进行了为期8周的饲养试验。试验饲料中添加0、0.8和1.2g/kg的短链低聚果寡糖，每天人工喂养4次(40尾/组，初始体重(5.55±0.02)g)。试验结束时，结果表明，随着饲料中ScFOS水平的提高，杂交罗非鱼的最终体重(FBW，g)和比生长率(SGR，%/d)显著提高(P0.10)，日采食量(fi，g/(d·鱼))也增加(P0.10)，饲料转化率(FCR)和肝胰腺指数(HI，Hi)也显著提高(P0.10%)随饲料中scFOS含量的增加而降低(P0.10)。成活率(SR，%)、最终体重变异系数(%)和条件因子(Cf，g/cm3)不受scFOS的影响(P0.10)。所有受试罗非鱼的肠道细菌数量都没有显著增加(P0.10)。研究表明，饲料中添加scFOS对罗非鱼的生长、饲料转化率和肠道菌群有一定的影响。因此，杂交罗非鱼的适宜饲料scFOS水平为1.2g/kg。
An 8-week feeding trial was conducted to investigate the effect of short-chain fructo-oligosaccharides(ScFOS,Profeed,95%) on the intestinal microflora,mortality and growth performance of hybrid tilapia Oreochromis aurea♂×O.nilotica♀.ScFOS was included at 0,0.8,or 1.2 g/kg in trial diets and hand-fed to satiation four times daily to triplicate groups of hybrid tilapia(40 fish/group,initial body weight(5.55±0.02) g) reared in a flow-through system.At the end of the feeding trial,the animals were bulk weighed and various morphologic parameters were assessed.Intestinal samples from three individuals of each group were pooled in order to conduct the quantitative analysis of Vibrio parahaemolyticus,Aeromonas hydrophila,Lactobacillus sp.,and Streptococcus faecalis by selected agar.The results showed that final body weight(FBW,g) and specific growth rate(SGR,%/d) were significantly improved with the increasing level of ScFOS in the diets for hybrid tilapia(P0.10),and daily feed intake(FI,g/(d·fish)) also increased(P0.10).Feed conversion ratio(FCR) and hepatopancreasomatic index(HI,%) were decreased with the ascending dietary ScFOS content(P0.10).Survival rate(SR,%),C.V.of the final body weight(%),and condition factor(CF,g/cm3) were not affected by ScFOS(P0.10).All the intestinal bacteria tested showed a non-significant increase in hybrid tilapia(P0.10).The study indicates that dietary ScFOS may have beneficial effects on growth,feed conversion,intestinal microflora in tilapia.Based on our results,the optimal dietary ScFOS level should be 1.2 g/kg for hybrid tilapia.