生长阉牛十二指肠可吸收氨基酸供给量的预测模型研究

The studies on the predictable model of the absorbed amino acid supply at the proximal duodenum in growing beef cattle

试验选用5头手术安装瘤胃、十二指肠和回肠末端T型瘘管的杂交改良阉牛,采用5×5重复设计,每期饲喂以玉米、棉粕、豆粕和氨化稻草为原料而配制的日粮,测定了十二指肠、回肠中内容物的干物质、粗蛋白和各种氨基酸的流量,并计算了各种氨基酸在十二指肠前端的理论浓度和实测浓度之间的回归方程。结果表明,到达十二指肠前端的粗蛋白实测流量(g/d,y)与理论流量(g/d,x)存在强相关,回归方程为:ycp=0.9647xcp+5.2998(R2=0.9636,n=5);各种氨基酸的实测浓度(y)与理论浓度(x)之间存在强相关(Ala、Val除外),它们分别为yAsp=0.7275xAsp+2.8943(R2=0.9964,n=5)、ySer=-3.1577xSer+20.864(R2=0.8474,n=5)、yGlu=0.9993xGlu-1.0355(R2=0.995,n=5)、yThr=0.8055xThr+0.7977(R2=0.8381,n=5)、yGly=0.5563xGly+3.6117(R2=0.8692,n=5)、yArg=1.5039xArg-3.0157(R2=0.8366,n=5)、yAla=-0.9182xAla+14.018(R2=0.5247,n=5)、yTyr=6.9071xTyr-22.162(R2=0.8235,n=5)、yPro=0.7962xPro+1.0732(R2=0.9207,n=5)、yVal=0.0758xVal+4.3453(R2=0.5597,n=5)、yPhe=-0.6437xPhe+8.6589(R2=0.9308,n=5)、yIle=4.4403xIle-17.329(R2=0.9509,n=5)、yLeu=1.8759xLeu-8.4109(R2=0.8723,n=5)、yHis=16.142xHis-35.564(R2=0.8962,n=5)、yLys=0.