【摘要】 试验旨在测定育肥羊饲喂全混合日粮(TMR)条件下瘤胃食糜外流速度(Kp)及干物质(DM)、有机物(OM)及粗蛋白质(CP)的有效降解率。选取3只安装有永久性瘤胃瘘管、体重(30.0±3.7)kg的哈萨克公羔羊作为试验动物,代谢笼内单笼饲养。按3×3拉丁方试验设计,分别饲喂3种能量水平一致而CP水平不同(11%、12%和13%)的TMR。采用醋酸镱(Yb-ac)作为固相食糜标记物,测定镱(Yb)元素的浓度,绘制浓度衰减曲线,利用非线性回归法拟合其Kp,并计算全混合日粮的瘤胃有效降解率。结果显示,3种TMR的瘤胃固相食糜的Kp值分别为6.71、6.66和7.59%/h,TMR1的DM、OM和CP的有效降解率分别为39.82%、38.58%和43.87%;TMR2的为35.70%、34.40%和36.86%;TMR3的为42.46%、41.29%和51.28%。3种TMR的DM在瘤胃中的有效停留时间分别为26.49、28.98和21.73h。此结果为进一步评定TMR的DM及过瘤胃氨基酸的小肠消化率研究提供了重要参数。更多还原

【Abstract】 This experiment was amied to measure the rumen digesta passage rate and effective degradation of DM,OM and CP of finishing lambs feeding the total mixed ration(TMR).Three Kazakh wethers with(30.0±3.7)kg body weight and permanent rumen fistula were chosen and the 3×3Latin square design was adopted.Three kinds of TMR were designed of which the energy level were same and CP levels were 11%,12% and 13%,respectively.Acetic acid ytterbium(Yb-ac)was used as solid phase chyme marker to measure the Yb element decay curve plotted by NLIN regression and figure out its outflow rate(Kp),and calculate the rumen effective degradability rate of TMR.The result showed that the Kp value of three kinds of TMR were 6.71,6.66 and 7.59 %/h,respectively.Under these conditions,the effective degradation rate of DM,OM and CP of TMR1 were 39.82%,38.58% and 43.87%,that of TMR2 were 35.70%,34.40% and36.86%,while that of TMR3 were 42.46%、41.29% and 51.28%.The average rumen retention time were 26.49,28.98 and 21.73 h,respectively.The results of this study provided some important parameters for further evaluating DM and RUP-AA intestinal digestion of TMR.更多还原