Broilers Performance, Carcass Quality and Intestinal Viscosity in Response to
-Mannanase Enzyme

The experiment was conducted to test the effect of β-mannanase enzyme addation in broiler chicken diets contain three metabolizable energy levels on performance, carcass quality and intestine viscosity. This study was arranged by complete random design (CRD) in arrangement by factorial procedure (2×3). Six treatments were used that consist of two levels of enzyme (0 and 0.05%) and three levels of metabolizable energy (2850, 2900 and 3000 Kcal/Kg). The results of this study were shown that body weight was significantly increased by enzyme suplementation (2258.99 g) at 42 day of age (p<0.05) but energy level was not affected on body weight. The difference was appeared at 35 days of age in 3000 Kcal/Kg energy level. Reduction in feed intakes was indicated with enzyme supplementation at 21 days of age and feed intake was increased significantly by 2850 Kcal/Kg energy level (P<0.05). While the lowest level of feed was recognized in 3000+0.05 group (649.69 g) and highest levels were shown by treatments 2850+0 (716.54 g). No responses was found in feed intake at 35 and 42 days of age by experimental agents. Feed conversion ration (FCR) was significantly higher in 2850 kcal/kg ME (1.13) at 21 days of age compared with other levels of energy. This was lower at 35 and 42 days of age for 0.05% enzyme in comparison to zero level (P<0.05). Breast meat, abdominal fat and pancreas percentage wre not affected by experimental main effects, but breast and abdominal fat percentage were incresed in treatments 2850+0.05 (%4.25) and 2900+0.05 (%37.20) respectively (P<0.05). Viscosity was reduced by 2900 kcal/kg ME (1.73 cps) and 0.05% enzyme (1.84 cps). The results of this study were shown that in low energy level body weight increased, and feed intake, viscosity and FCR decreased with β-mannanase enzyme suplememtation.