【摘要】 为研究急性热应激对肉仔鸡矿物质代谢的影响 ,本试验采用 2 0只 9周龄肉仔鸡 ,分成两组 ,一组施人工肛门术用于集尿 ,另一组施血管插管术用于连续采血 ,在程控人工气候舱内设置急性热暴露条件 ,即 1h内由 2 0℃升温至 33℃维持 3h后迅速降至常温。分别在热应激前、中、后连续采集尿和血样 ,并测定矿物质元素含量。结果表明 ,急性热应激显著影响血浆中Cu、Fe、Mn、Co、Ca、Na、Mg、K、Cr的浓度 (P <0 .0 5) ,而对P、Zn浓度无影响 (P >0 .0 5) ;血浆中各种矿物元素浓度对急性热应激的反映快慢程度不同 ,应激结束后恢复原状的时间也不同。急性短期热暴露使肉鸡尿Zn、Fe、Mn和Cr排出量发生显著变化 (P <0 0 5) ,其中尿Zn、Fe和Mn排出量比热暴露前明显升高 ,而尿Cr排出量下降。更多还原

【Abstract】 Twenty 9 week old Avian broilers were used to examine the effects of acute heat stress on metabolization of minerals.All birds were exposed to 20 ℃ for lh,to 33℃ for 3h and then to 20 ℃ rapidly.10 colostomized birds were used to collect urine every 24 h.Serial blood samples were collected from the other 10 birds via vein cannula. The result showed that plasma Cu,Fe,Mn,Co,Ca,Na,Mg,K,Cr concetation were affected by acute heat exposure significantly,whereas,P and Zn concentiation has no reaction to the acute heat exposure.Plasma minerals concentation were different in sensitivity to heat stress.After acute heat exposure,excretion of Zn,Fe,Mn and Cr in urine changed markedly.The excretion of Zn,Fe and Mn increased,and urinary Cr declined.更多还原