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草业学报  2012 

高精料诱导的SARA对泌乳期山羊血液和瘤胃液中皮质醇的影响

, PP. 259-266

Keywords: 精粗比,亚急性瘤胃酸中毒,皮质醇,肝脏,山羊

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Abstract:

选择7只装有永久性瘤胃瘘管的泌乳中期山羊,2×2拉丁方设计,分别饲喂精粗比为6∶4和4∶6的饲料,通过饲喂精粗比6∶4饲料建立泌乳期山羊瘤胃亚急性酸中毒(subacuteruminalacidosis,SARA)模型,研究SARA时山羊血液和瘤胃液中皮质醇浓度、肝脏皮质醇受体(glucocorticoidreceptor,GR)mRNA表达及其他相关指标的变化。结果表明,精粗比6∶4日粮饲喂2周后成功诱导SARA状态(SARA组),采食后瘤胃液pH值低于5.8持续时间约6h,而精粗比为4∶6组山羊瘤胃液pH均高于6.0(对照组)。高精料日粮处理对瘤胃pH和乳酸以及瘤胃液和血浆内的脂多糖、皮质醇浓度有显著性影响(P<0.05),采食前SARA组山羊瘤胃液中乳酸浓度显著高于对照组(P<0.05),采食后0~4h乳酸含量下降,6~10h时逐渐增加并极显著高于对照组(P<0.01);2组间瘤胃液中脂多糖浓度无显著性差异(P>0.05),SARA组血浆脂多糖浓度在采食前和采食后6h均显著高于对照组(P<0.05);采食前SARA组山羊血液中皮质醇浓度高于对照组(P=0.05),但采食后6h两组间无显著差异(P>0.05);2组山羊瘤胃液中皮质醇浓度在采食后2,4和6h分别显著高于对照组(P<0.05),但在采食前和采食后10h无显著差异(P>0.05)。Real-timePCR结果显示,SARA组山羊肝脏中GRmRNA表达显著下调(P<0.05)。本研究结果显示,泌乳期山羊发生SARA时糖皮质激素水平升高,负反馈下调肝脏GR的表达水平,提示SARA时机体处于应激状态,可能引起肝脏的物质代谢和营养物质重分配的改变。

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