α-半乳糖苷酶和木聚糖酶复合酶对玉米-豆粕型饲粮肉鸡生长性能、养分消化率、食糜黏度和消化酶活性的影响。
Impact of combined α-galactosidase and xylanase enzymes on growth performance, nutrients digestibility, chyme viscosity, and enzymes activity of broilers fed corn-soybean diets.
机构信息
National Key Laboratory of Animal Nutrition, College of Animal Science, China Agricultural University, Beijing 100091, China.
Industrial Técnica Pecuaria S.A. (ITPSA), Barcelona 08011, Spain.
出版信息
J Anim Sci. 2021 Jun 1;99(6). doi: 10.1093/jas/skab088.
Two experiments were conducted to investigate the effects of a combined α-galactosidase and xylanase preparation on nutrients digestibility and growth performance in broiler chickens. Experiment 1 had 240 broilers allocated to 3 treatments with the dietary supplementation of 0, 300, and 500 g/t of the enzyme combination. Diet and amino acid (AA) digestibility were assessed. Experiment 2 was a 2 × 3 (enzyme × diet) factorial arrangement with 10 replicates of 12 male broilers per replicate. Diets were based on corn-soybean meal (SBM) diet and had 3 nutritional levels (normal, 2% apparent metabolizable energy (AME) and crude protein (CP) reduction, and 4% AME and CP reduction). Each of these diets was fed with or without enzyme supplementation. Growth performance, chyme viscosity, nutrients digestibility, and endogenous enzymes activity were assessed. In experiment 1, enzyme supplementation improved the digestibility of Ca (P = 0.025) and ileal digestibility of total AA, Pro, Alu, Ile, Lys, His, Thr, Glu, Val, Leu, Tyr, and Phe (P < 0.05), and also tended to increase the AME of diets (P < 0.10). In experiment 2, broilers fed the corn-SBM diet with 4% nutrient reduction had better growth performance (P < 0.05), jejunal digesta viscosity at 42 d (P < 0.01), and lower digestibility of gross energy (GE; P < 0.05) when compared with those fed the normal nutrient diet. Enzyme inclusion increased digestibility of CP (P = 0.044), GE (P = 0.009), raffinose (P < 0.001) and stachyose (P < 0.001), improved average daily gain (P = 0.031), and reduced jejunal digesta viscosity at 42 d (P = 0.011). Besides, similar improvements trend in amylase, trypsin, sucrase, and maltase activity with enzyme inclusion were observed as with energy. These data support that the enzyme supplementation increased nutrients and ileal AA digestibility, improved performance and endogenous enzymes activity.
两项实验研究了一种α-半乳糖苷酶和木聚糖酶制剂对肉鸡营养物质消化率和生产性能的影响。实验 1 中，将 240 只肉鸡分配到 3 个处理组，日粮中分别添加 0、300 和 500 g/t 的酶制剂。评估了日粮和氨基酸（AA）消化率。实验 2 是一个 2×3（酶×日粮）的析因设计，每个处理组有 10 个重复，每个重复有 12 只雄性肉鸡。日粮以玉米-豆粕（SBM）为基础，有 3 个营养水平（正常、2%表观代谢能（AME）和粗蛋白（CP）降低、4%AME 和 CP 降低）。这些日粮中分别添加或不添加酶制剂。评估了生长性能、食糜黏度、营养物质消化率和内源性酶活性。在实验 1 中，酶制剂添加提高了钙（P=0.025）和回肠总 AA、Pro、Ala、Ile、Lys、His、Thr、Glu、Val、Leu、Tyr 和 Phe 的消化率（P<0.05），并倾向于提高日粮的 AME（P<0.10）。在实验 2 中，与饲喂正常营养日粮的肉鸡相比，饲喂 4%营养素降低的玉米-SBM 日粮的肉鸡生长性能更好（P<0.05），42 日龄空肠食糜黏度更低（P<0.01），总能（GE）消化率更低（P<0.05）。添加酶制剂提高了 CP（P=0.044）、GE（P=0.009）、棉子糖（P<0.001）和水苏糖（P<0.001）的消化率，提高了平均日增重（P=0.031），降低了 42 日龄空肠食糜黏度（P=0.011）。此外，与能量相似，添加酶制剂也观察到淀粉酶、胰蛋白酶、蔗糖酶和麦芽糖酶活性的类似改善趋势。这些数据表明，酶制剂的添加提高了营养物质和回肠 AA 的消化率，改善了生产性能和内源性酶活性。
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