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Effect of dietary β-mannanase supplementation on growth performance, intestinal morphology, digesta viscosity, and nutrient utilization in broiler chickens: Meta-analysis and meta-regression |
Hyun Woo Kim1 
, Chan Ho Kwon1
, Ji Hye Lee1
, Min Sung Kang1
, Dong Yong Kil1,*
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Department of Animal Science and Technology, Chung-Ang University, Anseong 17546, Korea |
Correspondence:
Dong Yong Kil, Tel: +82-31-670-3028, Fax: +82-31-675-3108, Email: dongyong@cau.ac.kr
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Received: 2 July 2024 • Revised: 2 August 2024 • Accepted: 14 August 2024 |
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| Abstract |
Objective
The present study aimed to investigate the effectiveness of dietary β-mannanase supplementation on growth performance, intestinal morphology, digesta viscosity, and dietary nutrient utilization in broiler chickens through a meta-analysis. The effects were further examined by a meta-regression analysis with activity levels of β-mannanase in broiler diets.
Methods
A total of 23 studies, which conducted in 11 countries and completed between December 2003 and August 2023, were finally selected for this meta-analysis. The standardized mean difference (SMD) and its 95% confidence interval (CI) were calculated as the effect size metrics using random effect model, with I2 value being utilized to measure heterogeneity. Investigated measurements included body weight gain (BWG), feed intake (FI), feed conversion ratio (FCR), villus height (VH), crypt depth (CD), VH:CD ratio, digesta viscosity, nitrogen-corrected metabolizable energy (AMEn), apparent ileal digestibility (AID), and apparent total tract retention (ATTR) of dry matter (DM), gross energy (GE), and nitrogen (N). All statistical analyses were performed using R version 4.3.3.
Results
Results revealed significant positive effects of dietary β-mannanase supplementation on BWG (P = 0.005), FCR (P < 0.001), VH (P < 0.001), VH:CD (P < 0.001), digesta viscosity (P < 0.001), AMEn (P = 0.011), AID of GE (P = 0.002) and N (P = 0.003), and ATTR of DM (P = 0.019), GE (P = 0.002), and N (P = 0.005) in broiler chickens. In the meta-regression analysis, increasing activity levels of β-mannanase in broiler diets increased VH:CD (P < 0.001, R2 = 79.2%) and AID of N (P = 0.038, R2 = 67.4%).
Conclusion
the current meta-analysis indicates that dietary β-mannanase supplementation improves energy and nutrient utilization in broiler diets possibly by decreasing digesta viscosity and enhancing intestinal morphology in broiler chickens. These beneficial effects can contribute to improved growth performance in broiler chickens.
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| Keywords:
Broiler Chicken; β-Mannanase; Growth Performance; Meta-analysis; Meta-regression |
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