Efficacy of Supplementation of Exogenous Phytase Enzyme on Productivity and Carcass Characteristics of Different Strain of Commercial Broilers

Abstract

An experiment was conducted to investigate the effect the efficacy of supplementation of exogenous phytase enzyme on productivity and carcass characteristics of different strain of commercial broilers at the open sided poultry shed in Hajee Mohammad Danesh Science and Technology University, Dinajpur. There were four strains of commercial broiler such as Fast feather, Arbor acres, Cobb500 and Hubbard classic each having 78 number used for the experiment for a period ' of 5 weeks. A total number of 312 day old straight run broiler chicks were distributed to two dietary treatments i.e. basal diet (Control-To) and basal diet supplemented with phytase enzyme @ 1gm/kg feed. The results indicated that broilers given diets supplemented with phytase have enhanced body weight and weight gain when compared with these fed basal diet (P<0.05). The final body weight was increased significantly (P<0.01) on T;C (Cobb-500 fed diet with 1g phytase enzyme/kg feed) and T,F (Fast feather fed diet with 1g phytase enzyme/kg feed) compared to control. There were significant difference (P>0.05) among different treatments in relation to feed consumption. Significant differences (P<0.01) were found in feed conversion ratios among birds fed on diet treated with phytase enzyme. Feed conversion ratios during the 5" week of age was 1.88, 1.87, 1.82, 1.86, 1.77, 1.72, 1.75 and 1.70 in ToF, ToA, ToC, ToH, TiF, T;A, TiC and T,H treatment groups respectively. Livability was similar in different treatments. Phytase supplementation had no significant effect on carcass cuts and dressing percent compared to non-phytase group. Dressing parameters were almost similar in different treatments and the differences were insignificant among treatment but the dressing weight percentage, thigh weight percentage and drumstick weight percentage were significant (P>0.01). Profitable ratios of the phytase groups were always higher than the control group. The cost of production was the highest in treatment T\F followed by treatment T)C, ToF, T1A, ToC, ToA, TiH, and ToH. Net profit per live broiler was the highest in treatment T,;A followed by treatment T,C, TjF, TH, ToC, ToF, ToA, and ToH respectively. Result of the present study suggests that the addition of dietary phytage was found to increase production performance and reduced cost of production.