肉牛混合日粮不同进食水平对尿中嘌呤衍生物排出量的影响  

Effect of Different level of Feed Intake on the Urinary Excretion of Purine Derivatives in Chinese Yellow Cattle

作　　者：王永新[1,2] 莫放[1] 董宽虎[2] 黄应祥[2] 高登宏[1,2] 陈瑶[1] 

机构地区：[1]中国农业大学动物营养学国家重点实验室,北京100094 [2]山西农业大学动物科技学院,太谷030801

出　　处：《中国农学通报》2008年第12期11-15,共5页Chinese Agricultural Science Bulletin

基　　金：FAO/IAEA资助研究项目"IAEA Research Contract No:l0563/Regular Budget Fund"

摘　　要：为研究肉牛不同进食水平对尿中嘌呤衍生物(PD)排出量的影响,试验选用4头当地黄牛按4×4拉丁方设计进行两期消化代谢试验,两个试验的日粮由精料和粗料由40:60(试验1)和60:40(试验2)组成,试验日粮分别按"自由采食量"的100%、80%、60%和40%饲喂4种相同组分不同进食量的日粮,用全收粪法和全收尿法分别测定有机物(OM)的消化率和尿中PD排出量,试验结果表明,日粮进食水平对全消化道OM表观消化率没有明显影响(P>0.05),尿中PD排出量随进食水平提高而增加(P<0.05),而尿中肌酸酐的排出量没有明显差异(P>0.05),尿中PD排出量可以用来估测瘤胃微生物蛋白质产生量。Tow experiments,each using four Chinese Yellow Cattle steers,were conducted to study the effect of different level of feed intake on the uric excretion of purine derivatives（PD）.The rations used in the two experiments were mixed ration consisting of a roughage and concentrate in the ratio of 40：60（Experiments 1）and 60：40（Experiments 2）respectively.In each experiments,four steers were fed at four fixed levels,100%,80%,60% and 40% of ＂voluntary intake＂,using a 4×4 Latin square design.Urine and faeces were collected during the last week（col1ection period）of each feeding period.The apparent digestibilities of OM were not significant among intake level.The daily excretion of PD showed a positive response to the level of intake of DOM.However,the creatinine excretion in urine was no difference at different level intake.The results indicate that PD excretion in the urine can be used as an index for estimating microbial protein supply in Chinese Yellow Cattle.

关 键 词：肉牛 进食水平 嘌呤衍生物 肌酸酐 

分 类 号：S815.5[农业科学—畜牧学]