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精氨酸对免疫应激仔猪肠道组织Toll样受体基因表达的影响

DOI: 10.3969/j.issn.1006-267x.2011.09.011

Keywords: 精氨酸,断奶仔猪,免疫应激,Toll样受体

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Abstract:

本试验旨在考察饲粮添加精氨酸(arginine,Arg)对免疫应激仔猪生长性能和肠道组织细胞膜外Toll样受体(TLR2、TLR4、TLR5、TLR6)基因表达的影响。选用(24±1)日龄的断奶、平均体重(7.19±0.63)kg的杜洛克×长白×大白公猪20头,随机分为4个处理,分别为饲喂基础饲粮+注射生理盐水(对照组)、饲喂基础饲粮+注射沙门氏杆菌活疫苗(S.C500)(S.C500组)、饲喂基础饲粮添加0.5%Arg+注射S.C500(0.5%Arg组)和饲喂基础饲粮添加1.0%Arg+注射S.C500(1.0%Arg组),每个处理5个重复,每个重复1头仔猪。应激处理于第8天实施,肌肉注射S.C5004mL。试验期17d。第8(免疫应激前)、9、11、18天采集血样测定血清沙门氏菌抗体水平和IL-6浓度,第18天仔猪屠宰采集空肠和回肠组织样品,测定Toll样受体mRNA表达量。结果表明:与对照组相比,仔猪肌肉注射S.C500不同程度地降低了平均日增重(ADG)(P<0.10)和平均日采食量(ADFI)(P<0.05),显著增加了在第9、11和18天血清IL-6浓度(P<0.05),同时显著上调了空肠和回肠组织中TLR4和TLR5mRNA表达量(P<0.05);添加Arg(0.5%和1.0%)能够缓减疫苗注射导致的以上抑制的效应,显著抑制了仔猪血清IL-6浓度、空肠和回肠TLR4和TLR5mRNA表达量的上调(P<0.05)。结果提示,饲粮添加Arg能显著减缓因S.C500注射引起的断奶仔猪肠道TLR4和TLR5基因的过度表达、血清IL-6浓度的升高,从而缓解免疫应激对仔猪的损伤。

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