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Effects of dietary β-mannanase supplementation in low-energy and low-protein diets containing high-mannan ingredients on growth performance, meat quality, intestinal morphology, and liver health in broiler chickens |
Eun Cheol Lee1 
, Kang Hyeon Kim1
, Charline Mugeniwayesu1
, Ye Jin Jeong1
, Dong Yong Kil1,*
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Department of Animal Science and Technology, Chung-Ang University, Anseong-si Gyeonggi-do , Korea |
Correspondence:
Dong Yong Kil, Tel: +82-31-670-3028, Email: dongyong@cau.ac.kr
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Received: 29 July 2025 • Revised: 2 October 2025 • Accepted: 23 October 2025 |
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| Abstract |
Objective
This study was conducted to investigate the effect of dietary β-mannanase (MN) supplementation in low-energy and low-protein diets containing high-mannan ingredients on growth performance, meat quality, intestinal morphology, and liver health in broiler chickens.
Methods
A total of 1,120 1-d-old Ross 308 broiler chickens were allotted to 1 of 5 dietary treatments. The positive control (PC) diet was prepared with corn and soybean meal, whereas the negative control (NC) diet was formulated with decreased AMEn by 100 kcal/kg and CP by approximately 1.0% than PC diets. High-mannan NC diet was also prepared by inclusion of 2.5% palm kernel meal (PKM) and 2.5% copra meal (CM), which contained energy and nutrient concentrations equal to those in the NC diet. Finally, dietary MN was supplemented to the high-mannan NC diet at 2 different levels of 0.05% and 0.10%.
Results
Broiler performance was impaired (p<0.05) by feeding low-energy and low-protein diets, regardless of inclusion of PKM and CM. No positive effects of dietary MN supplementation in low-energy and low-protein diets containing PKM and CM on broiler performance were observed. Inclusion of PKM and CM increased (p<0.05) jejunal digesta viscosity but 0.10% MN supplementation decreased (p<0.05) jejunal digesta viscosity. Likewise, a tendency (p=0.056) for increased villus height:crypt depth ratio was observed by 0.05% or 0.10% MN supplementation. However, dietary treatments had no effects on liver health in broiler chickens.
Conclusions
Feeding low-energy and low-protein diets with reduction in 100 kcal/kg AMEn and approximately 1.0% CP impaired broiler performance. Inclusion of 2.5% PKM and 2.5% CM with or without MN supplementation had no considerable effects on broiler performance. However, MN supplementation in low-energy and low-protein diets containing PKM and CM decreased digesta viscosity with improving jejunal morphology.
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| Keywords:
β-mannanase; broiler chicken; high-mannan ingredient; intestinal morphology; low-energy and low-protein diet; performance |
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