基于CNCPS模型的14种饲料瘤胃非降解蛋白组分小肠消化率研究  

A Study on Digestibility in Small Intestine of the Ruminal Undegraded Protein Fractions According to CNCPS Model of 14 Feedstuffs

作　　者：张英学[1] 林雪彦[1] 苏鹏程[1] 王云[1] 王中华[1] 

机构地区：[1]山东农业大学动物科技学院,泰安271018

出　　处：《畜牧兽医学报》2010年第11期1421-1427,共7页ACTA VETERINARIA ET ZOOTECHNICA SINICA

基　　金：国家现代农业(奶业)产业技术体系建设专项资金

摘　　要：CNCPS体系的氨基酸子模型是估计反刍动物十二指肠氨基酸流量的3种主要模型之一,该模型认为过瘤胃C蛋白组分在小肠中不能消化,但有研究表明一些非饲草类饲料的过瘤胃C蛋白组分具有较高的小肠消化率。本研究测定了14种饲料各蛋白组分的含量、各蛋白组分的瘤胃动态降解率和过瘤胃蛋白组分的CP小肠消化率,用这些数据按照推导的方程对各蛋白组分的小肠消化率进行了最小二乘估计。在以过瘤胃B1蛋白组分的小肠消化率100%为约束条件时得到了可信的估计结果,结果表明CNCPS模型设定过瘤胃B1、B2、B3蛋白组分小肠消化率分别为100%、100%和80%是可行的,但有8种饲料具有较高的过瘤胃C蛋白组分小肠消化率估计值,其中包括4种饲草类饲料,说明需要对CNCPS模型的过瘤胃C蛋白组分小肠消化率参数的合理性做进一步研究。The amino acid sub-model of Cornell net carbohydrate and protein system is one of the three published major model to predict ruminant duodenal amino acid flux at present.Previous studies indicated that the ruminal undegraded C protein fractions defined by CNCPS model of non-forage feedstuffs may be digestible in small intestine,which questioned the reliability of setting the digestibility of C protein fraction in small intestine to zero by the CNCPS model.Contents,dynamic degrading parameters in the rumen of each protein fractions,and CP digestibility of ruminal degrading residue at different sampling time point of 14 feedstuffs were measured in the present study.These data were used to estimate small intestine digestibility of each ruminal undegraded protein fraction by least square data fitting according a deduced equation.Reliable estimates were acquired when taking small intestine digestibility of ruminal undegraded C protein fraction was 100% as the restrictive condition.Results of the present study indicated that it was reasonable to set the small intestine digestibility of ruminal undegraded B1,B2,and B3 protein fractions as 100%,100%,and 80% by the CNCPS model.Small intestine digestibility of ruminal undegraded C protein fraction of 8 feedstuffs,4 of which were roughage,were high enough and can not be neglected,therefore it was reasonable to further investigate the reliability of setting the digestibility of C protein fraction to aero by the CNCPS model.

关 键 词：CNCPS C蛋白组分 小肠消化率 十二指肠 氨基酸 

分 类 号：S852.21[农业科学—基础兽医学] S816.11[农业科学—兽医学]