ArticleFood science of animal resources2026
Dietary β-mannanase supplementation and its effect on nutrient utilization and performance in broilers fed energy-reduced diets.
Article in Food science of animal resources, 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
This study evaluated whether β-mannanase systems incorporating additional glycoside hydrolase domains and accessory peptides provide functional advantages over conventional β-mannanase in broilers fed energy-reduced NSP-rich diets. This study evaluated the effects of positive control as basal diet (PC), negative control reduced metabolizable energy 120 kcal/kg in PC (NC), NC + 0.05% β-mannanase (M1), NC + 0.05% β-mannanase with upgraded glycoside hydrolase (M2), NC + 0.05% β-mannanase with upgraded glycoside hydrolase and accessory peptides (M3) on growth performance, nutrient digestibility, blood metabolites, carcass traits, and meat quality of broilers fed diets rich in non-starch polysaccharide (NSP). Results showed that β-mannanase supplementation (M2 and M3), but not conventional β-mannanase alone, synergistically increased (p < 0.05) digestive enzyme activity, and overall nutrient utilization. This increment translated into higher (p < 0.05) growth performance and feed conversion ratio. β-Mannanase supplementation also reduced (p < 0.05) intestinal viscosity, promoted endogenous protease activity, and increased (p < 0.05) the digestibility of key amino acids (AA) such as lysine, methionine, threonine, and valine. The M2 and M3 treatment lowered (p < 0.05) blood urea nitrogen levels, indicating more efficient protein utilization for growth. Furthermore, M2 and M3 supplementation increased (p < 0.05) thigh muscle proportions while reducing abdominal fat deposition, although no significant differences were observed in meat quality parameters (pH, water-holding capacity, shear force). Plasma AA levels remained unchanged, reflecting rapid utilization in protein synthesis and metabolism. Overall, these findings demonstrate that structural upgrading of β-mannanase rather than enzyme inclusion alone represents a distinct nutritional strategy to improve energy and protein utilization in broilers without negatively affecting meat physicochemical properties.
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