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ID:33959413
大小:2.05 MB
页数:50页
时间:2019-03-02
《日粮过瘤胃淀粉和脂肪水平对热应激奶牛生产性能和能量平衡的影响》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、新疆农业大学硕士学位论文日粮过瘤胃淀粉和脂肪水平对热应激奶牛生产性能和能量平衡的影响姓名:霍小凯申请学位级别:硕士专业:动物营养与饲料科学指导教师:王加启;雒秋江20090601日粮过瘤胃淀粉和脂肪水平对热应激奶牛生产性能和能量平衡的影响摘要本试验以预测日粮的过瘤胃淀粉含量为依据,通过测定奶牛常用饲料中过瘤胃淀粉的含量,配制含有不同水平过瘤胃淀粉和脂肪的日粮,观察日粮过瘤胃淀粉和脂肪水平对泌乳中期热应激奶牛生产性能和能量平衡的影响。试验1:选用3头安装有永久性瘤胃瘘管的利木赞×鲁西黄牛杂交阉牛为试验动物,采用尼龙袋法对破碎玉米、膨化玉米、蒸汽压片玉米、大麦、麸皮
2、、DDGS(玉米)、苹果粕、大豆皮、豆粕、苜蓿干草、青贮和羊草等12种奶牛常用饲料瘤胃降解率进行测定,并计算出12种饲料的过瘤胃淀粉含量。结果破碎玉米、膨化玉米、蒸汽压片玉米、大麦、麸皮、DDGS(玉米)、苹果粕、大豆皮、豆粕、苜蓿干草、青贮和羊草。过瘤胃淀粉含量(g/kg)依次为216.23、89.16、121.49、60.37、17.98、9.23、14.18、6.13、18.22、8.11、3.78和2.77。试验2:根据试验l的测定结果,结合试验牧场的日粮配方,研究了日粮三种不同水平过瘤胃淀粉和脂肪对泌乳中期热应激奶牛生产性能和能量平衡的影响。选择产后1
3、00.200天的中国荷斯坦奶牛54头,根据产奶量、分娩时间和胎次随机区组分为3个处理组:低过瘤胃淀粉高脂肪组(10wpostrumenstarchandhighfat,PFl01)、中过瘤胃淀粉中脂肪组(middlepostrumenstarchandmiddlefat,PFl31)和高过瘤胃淀粉低脂肪组(highpostrumenstarchandlowfat,PFl61),处理组日粮的能量蛋白相近。试验期间牛舍平均温湿指数为79.35。结果显示:各处理组间奶牛干物质采食量、体况评分和日增重差异均不显著(胗O.05);PFl61组较PFl01组奶牛产奶量有所提
4、高,乳蛋白含量较PFl01组显著升高(尸5、rchandFatindietsOilPerformanceandEnergyBalanceofHeat—StressedDairyCowsAbstractTheexperimentswereconductedtostudythelevelsofpostrumenstarchandfatindietsonperformanceandEnergyBalanceofheat—stresseddairyCOWS.Beforethefeedingtrail,wemustmeasuredtheamountofpostmenstarchonusualfeed,andthen6、adjustthedietsfordifferentpostrumenstarchandfat.Panl:ThreebullockofLimousinexLuXiyellowcattlefittedwithrun'leacannulaswereusedforthemeaSurementofamountsofpostrumenstarchinCrackedcorn,Intrumescentcorn,Steam—flackingcorn,wheat,wheatbran,DDGS(COm),applemeal,soybeanhull,soybeanmeal,alfal7、fahay,COrnsilageandgrasshaybythenylonbagtechnique.Theresultsshowthattheamountsofpostrumenstarch(g/kg)were:216.23,89.14,121.49,60.37,17.98,9.23,14.18,6.13,18.22,8.11,3.78and2.77.Pan2:AccordingtotheresultsofPart1andthecurrentlydiets.InvestigatetheeffectofPostrumcnstarchandfatonperforma8、nceandEnergy
5、rchandFatindietsOilPerformanceandEnergyBalanceofHeat—StressedDairyCowsAbstractTheexperimentswereconductedtostudythelevelsofpostrumenstarchandfatindietsonperformanceandEnergyBalanceofheat—stresseddairyCOWS.Beforethefeedingtrail,wemustmeasuredtheamountofpostmenstarchonusualfeed,andthen
6、adjustthedietsfordifferentpostrumenstarchandfat.Panl:ThreebullockofLimousinexLuXiyellowcattlefittedwithrun'leacannulaswereusedforthemeaSurementofamountsofpostrumenstarchinCrackedcorn,Intrumescentcorn,Steam—flackingcorn,wheat,wheatbran,DDGS(COm),applemeal,soybeanhull,soybeanmeal,alfal
7、fahay,COrnsilageandgrasshaybythenylonbagtechnique.Theresultsshowthattheamountsofpostrumenstarch(g/kg)were:216.23,89.14,121.49,60.37,17.98,9.23,14.18,6.13,18.22,8.11,3.78and2.77.Pan2:AccordingtotheresultsofPart1andthecurrentlydiets.InvestigatetheeffectofPostrumcnstarchandfatonperforma
8、nceandEnergy
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