Gracia M I, Araníbar M J, Lázaro R, Medel P, Mateos G G
Departamento de Produccion Animal, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain.
Poult Sci. 2003 Mar;82(3):436-42. doi: 10.1093/ps/82.3.436.
A 42-d trial was conducted to study the influence of exogenous alpha-amylase on digestive and performance traits in broilers fed a corn-soybean meal diet. There were two treatments (control and alpha-amylase supplemented diet) and six replicates (14 Cobb male chicks caged together) per treatment. At 7 d of age, alpha-amylase supplementation improved daily gain by 9.4% (P < or = 0.05) and feed conversion by 4.2% (P < or = 0.01). At the end of the trial, birds fed the alpha-amylase-supplemented diet ate more and grew faster (P < or = 0.05) and hadbetter feed conversion (P < or = 0.10) than broilers fed the control diet. Also, alpha-amylase supplementation improved apparent fecal digestibility of organic matter and starch (P < or = 0.01) and AMEn of the diet (P < or = 0.001). However, no effects were detected for CP or fat digestibility. Nutrient digestibility and AMEn of the diet increased with age (P < or = 0.001); however, no interactions of alpha-amylase x age were observed for any trait. Coefficients of apparent ileal and fecal digestibility of starch at 28 d of age were similar, which indicated that most of the undigested starch was not fermented in the hindgut of the chick. alpha-Amylase supplementation reduced relative pancreas weight (P < or = 0.001) but did not affect the weight of the remaining organs. Age consistently reduced intestinal viscosity and relative weights of all the organs (P < or = 0.001). The data indicated that alpha-amylase supplementation of a corn-soybean meal diet improved digestibility of nutrients and performance of broilers.
进行了一项为期42天的试验，以研究外源α-淀粉酶对以玉米-豆粕日粮饲喂的肉鸡消化和生产性能的影响。试验设两个处理（对照和添加α-淀粉酶的日粮），每个处理6个重复（每个重复14只Cobb雄性雏鸡，饲养在同一笼中）。7日龄时，添加α-淀粉酶使日增重提高了9.4%（P≤0.05），饲料转化率提高了4.2%（P≤0.01）。试验结束时，与饲喂对照日粮的肉鸡相比，饲喂添加α-淀粉酶日粮的肉鸡采食量更大、生长更快（P≤0.05），饲料转化率也更好（P≤0.10）。此外，添加α-淀粉酶提高了日粮中有机物和淀粉的表观粪便消化率（P≤0.01）以及日粮的表观代谢能（P≤0.001）。然而，未检测到对粗蛋白或脂肪消化率的影响。日粮的养分消化率和表观代谢能随日龄增加而提高（P≤0.001）；然而，未观察到α-淀粉酶与日龄对任何性状的交互作用。28日龄时淀粉的回肠表观消化率系数和粪便表观消化率系数相似，这表明大部分未消化的淀粉在雏鸡后肠未被发酵。添加α-淀粉酶降低了胰腺相对重量（P≤0.001），但不影响其余器官的重量。日龄持续降低肠道黏度和所有器官的相对重量（P≤0.001）。数据表明，在玉米-豆粕日粮中添加α-淀粉酶可提高肉鸡的养分消化率和生产性能。
