ArticleAnimal bioscience2026
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.
Article in Animal bioscience, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
objectiveThis 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.
methodsA 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%.
resultsBroiler 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.
conclusionFeeding 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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