饲粮瘤胃降解蛋白质水平对哈萨克育肥羊瘤胃微生物氮合成量和氮沉积量的影响  

Effects of Dietary Rumen Degradable Protein Level on Microbial Nitrogen Yield and Nitrogen Retention of Finishing Kazakh Sheep

作　　者：高杨[1] 高巍[1] 陈腾[1] 张梅[1] 倪传武 刘晨黎[1] 陈道富[1] 

机构地区：[1]石河子大学动物科技学院,石河子832003

出　　处：《动物营养学报》2015年第1期274-280,共7页CHINESE JOURNAL OF ANIMAL NUTRITION

基　　金：国家自然科学基金项目(31260557);兵团博士资金专项(2013BB018)

摘　　要：本试验旨在研究哈萨克羊育肥羊在以低质粗饲料条件下,增加饲粮瘤胃降解蛋白质(RDP)水平对瘤胃微生物氮(MN)合成量和氮沉积量的影响。选取体重为(30.0±2.8)kg的哈萨克羊育肥羊公羔3只作为试验动物,分别饲喂RDP水平为7.94%(TMR1)、9.02%(TMR2)、10.10%(TM R3)的3种饲粮。按照3×3拉丁方试验设计进行试验,共3期,每期预试期10 d,正试期5 d。全部收集粪尿,测定尿中嘌呤衍生物(PD)排出量、瘤胃MN合成量和转化效率。结果表明:3种饲粮的干物质及有机物的采食量及表观消化率均无显著性差异(P>0.05),但TM R3的氮沉积量、尿中PD排出量及瘤胃M N的合成量均显著高于TM R1和TM R2(P<0.05)。饲粮RDP水平与MN合成量/瘤胃表观可消化有机物(RADOM)采食量之间存在显著的正相关(R2=0.999 4,P=0.010 9)。M CP的转化效率不受饲粮RDP水平影响(P>0.05)。结果提示,低质粗饲料条件下,将饲粮RDP水平由7.94%提高至10.10%,能够提高哈萨克育肥羊氮沉积量,促进瘤胃MCP的合成,但未能显著提高MCP的转化效率。The aim of this study was to investigate the effects of increased dietary rumen degradable protein （ RDP） level on rumen microbial nitrogen （ MN） yield and nitrogen retention of finishing Kazakh sheep under inferior forage feeding condition. Three lambs weighed （30.0±2.8） kg were fed three diets with different RDP levels [7.94%（TMR1）, 9.02%（TMR2） and 10.10% （TMR3）]. A 3＆#215;3 Latin square experimental design was adopted. There were three periods with 10-day pretest period and 5-day test period in each period. Total collection of feces and urine method was used to determine urinary purine derivatives （ PD） excretion, rumen MN yield and conversion rate. The results showed as follows：the intake and apparent digestibility of dry matter （ DM） and organic matter （ OM） of the three diets were not significantly different （ P〉0.05） , however, nitrogen retention, urinary PD excretion as well as rumen MN yield of TMR3 were significantly higher than those in TMR1 and TMR2 （P〈0.05）. There was a significant positive relation between dietary RDP level and MN yield/digestible OM intake （ R^2=0.999 4,P=0.010 9） . The conversion rate of MCP was not affected by dietary RDP level （ P〉0.05） . The results indicate that under inferior forage feeding condition, when dietary RDP level is increased from 7. 94% to 10. 10%, nitrogen retention and rumen microbial protein （ MCP） synthesis can be improved, while the conversion rate of MCP is not affected.

关 键 词：嘌呤衍生物 微生物氮 瘤胃降解蛋白质 氮沉积 哈萨克羊 

分 类 号：S826[农业科学—畜牧学]