Performance responses of broilers and pigs fed diets with β-mannanase

ABSTRACT This study was developed using meta-analysis to evaluate the effect of β-mannanase on both poultry and pig performance. Two databases were constructed using information from previous studies that evaluated the β-mannanase supplementation in diets for broilers (30 papers; 19,643 birds) and pigs (20 papers; 5,319 animals). The meta-analysis followed three sequential analyses: graphical, correlation, and variance-covariance. The effect of β-mannanase supplementation on performance considerably varied in both databases. Data analysis considering the study effect showed that β-mannanase supplementation did not influence feed intake. Diets supplemented with β-mannanase did not influence weight gain, but improved feed conversion (−1%) of broilers compared with the control group. Feeding pigs diets supplemented with β-mannanase improved weight gain (+5%) and feed conversion (−6%) compared with pigs fed non-supplemented diets. β-mannanase supplementation increased the digestibility coefficient of dry matter, crude protein, and energy in both species. The inclusion of β-mannanase also improved the metabolizable energy content in broiler diets and enhanced the digestibility of energy in pig feeds. Current results indicate that β-mannanase can be considered as an important tool for nutritionists who search for improved feed conversions and nutrient digestibility coefficients.

摘要 本研究采用荟萃分析（meta-analysis）方法，评估β-甘露聚糖酶（β-mannanase）对家禽与生猪生产性能的影响。研究团队基于既往相关研究数据构建了两个数据库：其一收录了30篇关于肉鸡日粮添加β-甘露聚糖酶的研究文献，涵盖19643只试验肉鸡；其二收录了20篇关于生猪日粮添加该酶的研究文献，涵盖5319头试验生猪。本次荟萃分析依次开展三类分析：图形分析、相关性分析及方差协方差分析。两个数据库的结果均显示，日粮添加β-甘露聚糖酶对动物生产性能的影响存在显著异质性。考虑研究本身的效应后，数据分析结果表明，日粮添加β-甘露聚糖酶对动物采食量无显著影响。与对照组相比，肉鸡日粮添加β-甘露聚糖酶对其日增重无显著影响，但可改善饲料转化率（降幅达1%）。与饲喂基础日粮的生猪相比，饲喂添加β-甘露聚糖酶日粮的生猪日增重提升5%，饲料转化率降低6%。日粮添加β-甘露聚糖酶可提升两种试验动物的干物质、粗蛋白质及能量的消化系数。此外，肉鸡日粮中添加β-甘露聚糖酶可提升代谢能含量，而生猪日粮中添加该酶则可提升日粮能量消化率。本研究结果表明，对于致力于优化饲料转化率与营养物质消化系数的动物营养学家而言，β-甘露聚糖酶可作为一项重要的营养调控工具。