豆粕和棉粕日粮中添加α-半乳糖苷酶对肉仔鸡生长性能的影响

试验研究了豆粕日粮和含5%～8%棉粕的日粮中添加α-半乳糖苷酶对肉仔鸡生长性能的影响及可能机制。试验Ⅰ为肉仔鸡饲养试验,选用1日龄AA商品代肉仔鸡公雏672只,随机分为4个处理,每个处理12个重复,每个重复14只鸡,试验期42d。结果表明:在棉粕和豆粕日粮中添加α-半乳糖苷酶对42日龄肉仔鸡体增重分别提高了4.35%和3.49%。试验Ⅱ为排空强饲代谢试验。结果显示:豆粕日粮中添加α-半乳糖苷酶增加蛋公鸡色氨酸真消化率(P<0.001),对其他氨基酸消化率无影响。添加α-半乳糖苷酶的豆粕的,真代谢能值与不添加酶的相比,提高了4.69%(0.51MJ/kg)。本研究表明,在玉米-豆粕型日粮中添加α-半乳糖苷酶,提高了色氨酸真消化率和真代谢能,有利于提高肉仔鸡生长性能。

Beneficial Effect of α-Galactosidase Enzyme on Performance of Broiler Chickens Fed Diets Containing Soybean Meal and Cottonseed Meal

Two experiments were conducted to evaluate the potential use of α-galactosidase enzyme in soybean meal and soybean meal with 5%～8% inclusion of cottonseed meal.In EXP.1,a six-week feeding trial was done with 672 one-day old male broiler chicks(AA) and randomly allocated to four dietary treatments consisting of twelve replicates of 14 chicks each.The growth performance of birds fed soybean meal and cottonseed meal diets with supplemental enzymes was higher than that of the control by 4.35% and 3.49%,respectively at the age of 42 d.In EXP.2,true amino acid digestibility was not improved by enzyme supplementation except tryptophan(P<0.001).The average improvement of TME of soybean meal following the enzyme supplementation was 4.69%(121.1 kcal/kg) higher than that of the control.It can be concluded that the addition of α-galactosidase enzyme to the corn-soybean meal diet had beneficial effects on the growth performance of broiler chickens.