不同温度膨化全脂大豆对仔猪氮平衡和氨基酸消化率的影响

Effect of Extrusion on the Heal Digestibility of Amino Acids in Full Fat Soybean for Pig

本试验目的在于检测不同温度下蒸汽膨化的全脂大豆对仔猪氮平衡和氨基酸消化率的影响。2个氮平衡试验共用24头杂交去势公猪,平均体重5.1公斤,21日龄断奶时,在小肠末端手术安装T—形瘘管。所用基础日粮含1.25％赖氨酸,10％豆油。10％葡萄糖和浸提豆粕,利用经110℃、130℃和150℃蒸汽膨化处理的三种全脂大豆,以等氮和等赖氨酸来替代基础日粮中的豆粕,用玉米淀粉补足日粮的百分比。代谢试验室内安有自动控温和通风设备。每个氮平衡试验收集粪尿和食糜样本2期。结果表明,仔猪采食含有在130℃下膨化的全脂大豆日粮后,氮消化率高于(p<0.05)在110℃下膨化的全脂大豆。而经150℃膨化处理的大豆,氮存留量,氮消化率,氮存留量没有进一步的改善,经130℃膨化的全脂大豆其赖氨酸、蛋氨酸和异亮氨酸的回肠表观消化率,高于(p<0.05)经110℃和150℃处理的大豆。但是,苏氨酸、缬氨酸和亮氨酸的回肠末端表观消化率随膨化温度的升高而增加。本试验表明,全脂大豆经130℃蒸汽膨化处理有利于改善仔猪对大豆中赖氨酸、蛋氨酸和异亮氨酸的回肠表观消化率,可以改善氮沉积量和氮存留率,但与优质豆粕相比,效率不显著。

Twenty-four crossbred barrows (Initial avg. B. W. of 5. 1 kg)were fitted with T-cannula to determine the effect of extrusion of full fat soybeans A basal corn-soybean meal diet was formulated tocon-tain 1. 25% lysine. Soybean moisture extruded at 100℃ , 130℃ and 150℃ replaced soybean meal in the basal diet to provide isonitrogen and isolysine levels in each treatment. Apparent ileal digestibility of ly-sine,methionine and isoleucine were greater (P<0. 05)for diets with130℃ extruded soybeans compared with soybeans extruded at either 110℃and 150℃-Apparent ileal digestibility and retention of N as percentage of N absorbed or consumed were greater(P<0. 05) for diets containing 130℃ extruded soybeans than the diet containing 110℃ extruded soybeans. However, apparent ileal digestibility of threonine,va-line and leucine tended to be increased with extrusion temperature increased. In summary, extrusion of full fat soybean at 130℃ had higher ileal digestibility of iysine. methionine and isofeucine than at 110℃, however, extruded full fat soybeans had lower N-retention and apparent ileal digestibility of amino acids than commercial soybean meal for young pigs.