Dunaway Andrew, Adedokun Sunday A
Department of Animal and Food Sciences, University of Kentucky, Lexington, KY 40546, USA.
Animals (Basel). 2021 Feb 28;11(3):641. doi: 10.3390/ani11030641.
This study examined the effect of exogenous mixed-enzyme supplementation (xylanase, β-glucanase, and pectinase) to a corn-SBM (CS) and a wheat-CS-based (WCS) diet in birds challenged with coccidia vaccine (Coccivac B-52™). The WCS-based diet was produced by replacing 30% of the energy-yielding portions of the CS-based diet with wheat. On day 14, 448 ( = 7) Cobb by-product breeder male broilers were assigned to a 2 (diet types) × 2 (with or without enzyme supplementation) × 2 (0 or 20 × coccidia vaccine challenge; CVC) factorial arrangement of treatments in a completely randomized design for the determination of the apparent metabolizable energy (AME) value of wheat. Treatment effects on jejunum digesta viscosity and AME corrected for nitrogen (AMEn) of the diets were evaluated within each diet type as a 2 × 2 factorial arrangement of treatments, 7- and 14-day post-challenge. Seven-day post-challenge (day 21), dry matter (DM) and energy utilization, AME, and AMEn of the CS- and WCS-based diets decreased ( < 0.05) with CVC. Both AME and AMEn of wheat decreased ( < 0.05) by about a 20% in CVC-birds 7-day post-challenge. Enzyme and CVC resulted in a decrease ( < 0.05) in jejunal digesta viscosity in birds fed the CS-based diets, while there was an interaction ( < 0.05) between CVC and enzyme, with enzyme lowering ( < 0.05) the viscosity of digesta 7-day post-challenge. Results from this study showed that CVC resulted in a 20% decrease in AMEn 7-day post-challenge, while the interaction between exogenous enzyme supplementation and CVC resulted in an improvement in nitrogen utilization (~6%) in CVC birds fed the corn-SBM-based diet 7-days post challenge.
本研究检测了在受到球虫疫苗（Coccivac B - 52™）攻击的禽类中，向以玉米-豆粕（CS）和小麦-玉米-豆粕（WCS）为基础的日粮中添加外源复合酶（木聚糖酶、β-葡聚糖酶和果胶酶）的效果。基于WCS的日粮是通过用小麦替代基于CS的日粮中30%的提供能量部分而制成的。在第14天，将448只（每组7只）科布副产品种公鸡分配到一个2（日粮类型）×2（添加或不添加酶）×2（0或20倍球虫疫苗攻击；CVC）的析因试验设计中，以完全随机设计来测定小麦的表观代谢能（AME）值。在每种日粮类型中，将处理对空肠食糜粘度以及日粮氮校正表观代谢能（AMEn）的影响作为一个2×2的析因试验设计进行评估，在攻击后7天和14天进行评估。攻击后7天（第21天），基于CS和WCS的日粮的干物质（DM）和能量利用率、AME和AMEn随着CVC而降低（P<0.05）。在攻击后7天，CVC组中小麦的AME和AMEn均降低（P<0.05）约20%。酶和CVC导致采食基于CS日粮的禽类空肠食糜粘度降低（P<0.05），而CVC和酶之间存在交互作用（P<0.05），在攻击后7天酶降低了（P<0.05）食糜粘度。本研究结果表明，CVC导致攻击后7天AMEn降低20%，而外源酶添加与CVC之间的交互作用使攻击后7天采食基于玉米-豆粕日粮的CVC禽类的氮利用率提高了约6%。
