饲粮直链/支链淀粉和淀粉酶对肉鸡生长性能的影响及其互作效应研究

Effects of Dietary Amylose/Amylopectin and Amylase on Growth Performance of Broilers and Their Interaction Effect

本试验旨在研究饲粮直链/支链淀粉和淀粉酶对肉鸡生长性能和营养物质表观消化率的影响。试验采用4×3双因子设计,选用1日龄爱拔益加(AA)肉仔鸡960只,随机分为12个组,每组5个重复,每个重复16羽肉鸡,饲粮直链/支链淀粉分别为0.11、0.23、0.35、0.47,淀粉酶的添加量分别为0、3000、6000U/kg。试验期为21d。试验测定了肉鸡生长性能和营养物质表观消化率。结果表明:1)直链/支链淀粉为0.23的饲粮组肉鸡的平均日增重显著提高(P<0.05),料重比以直链/支链淀粉为0.47的饲粮组最高(P<0.05),其他组间差异不显著(P>0.05);饲粮中添加6000U/kg淀粉酶显著降低肉鸡平均日增重(P<0.05),但对料重比影响不显著(P>0.05);二者的互作效应不显著(P>0.05)。2)能量、粗蛋白质、干物质、粗脂肪以及钙表观消化率以直链/支链淀粉为0.11的饲粮组最高(P<0.05),直链/支链淀粉为0.47的饲粮组最低(P<0.05);饲粮中添加淀粉酶对营养物质表观消化率影响不显著(P>0.05);二者的互作效应对营养物质表观消化率影响显著(P<0.05)。综上所述,饲喂直链/支链淀粉为0.23和淀粉酶添加量为3 000 U/kg的饲粮可提高肉鸡的生长性能。

The purpose of this experiment was to study the effects of amylose/amylopectin and amylase on growth performance and nutrient apparent digestibility of broilers. The experiment used a 4 × 3 two factor design,and a total of 960 Arbor Acres( AA) broilers at 1 day of age were randomly divided into 12 groups with5 replicats in each group and 16 broilers in each replicat. The dietary amylose/amylopectin were 0.11,0.23,0. 35 and 0.47,and the addition amounts of amylase were 0,3 000 and 6 000 U/kg,respectively. The test period was 21 d,and the growth performance and nutrient apparent digestibility of broilers were determined. The results showed as follows: 1) the average daily gain of broilers in the group with amylose/amylopectin of 0.23 significantly increased( P<0.05),and the feed/gain was the highest in the group with amylose/amylopectin of0.47( P<0.05),the other groups were not significantly different( P>0.05);the addition of 6 000 U/kg amylase in the diets significantly reduced the average daily gain of broilers( P < 0.05),but the effect on the feed/gain was not significant( P>0.05);the interaction effect was not significant( P > 0.05). 2) The apparent digestibility of energy,crude protein,dry matter,crude fat and calcium were the highest in the group with amylose/amylopectin of 0.11( P < 0. 05),and the lowest in the group with amylose/amylopectin of 0. 47( P <0.05);the addition of amylase in diets had no significant effect on nutrient apparent digestibility( P > 0.05);the interaction effect had significant effect on nutrient apparent digestibility( P<0.05). In conclusion,feeding diets with amylose/amylopectin of 0.23 and amylase addition of 3 000 U/kg can improve the growth performance of broilers.