早期断奶仔猪日粮中添加不同种类酸化剂的效果

Effects of Adding Different Kinds of Acidifiers into the Diet of Early Weanling Piglets

选用杂种仔猪（杜洛克×长白×大白）１２５头，于２８±３日龄断奶，以玉米－豆粕－鱼粉型日粮饲喂，进行为期２８天的饲养试验，研究日粮中添加柠檬酸（１％）、磷酸（０．３％）及复合酸（０．３％和０．５％）对仔猪生产性能、日粮蛋白质消化率、胃肠道消化酶活力及肠道大肠杆菌数的影响。结果表明，日粮中添加各种酸化剂可提高仔猪日增重９－１７％（Ｐ＞０．０５）；日粮中添加柠檬酸和复合酸则可显著提高饲料转化效率１１－１５％（Ｐ＜０．０５）；日粮中添加０．３％磷酸可提高饲料利用效率８％（Ｐ＞０．０５）。添加酸化剂对日粮蛋白质消化率无影响。柠檬酸和磷酸有降低胃肠道ｐＨ值、提高胰蛋白酶、淀粉酶活力及减少结肠中大肠杆菌数的趋势。

A trial with125 crossbred (Duroc×Landrace×Yorkshire)piglets weaned at 28±3 days of age was conducted.The results showed that addition of acidifiers to the diet increased the piglet daily gain 9￣17%(P>0.05).Addition of citric acid and acid blend to the diet improved the feed conversion efficiency 11￣15%(P<0.05).Addition of 0.3% phosphoric acid to the diet improved the feed conversion efficiency 8%(P>0.05).No effect of acidifers on the dietary protein digestibility.Inclusion of citric acid and the phosphoric acid in the diets tended to decrease the gastro intestinal pH,increase the activities of trypsin and amylase and reduce the number of coliform bacteria in the colon.