ScholarWorks@중앙대학교

초록

This study was conducted to investigate the effect of dietary &#x3b2;-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. 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%. : 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. s: 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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