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ME Value of Natuzyme 2008/2009 Estimation of metabolisable energy, crude protein and phosphorus equivalency values of enzyme and its effect on broiler chicks performance and mineral utilization Abstract Four experiments were conducted to estimation of metabolisable energy, crude protein and phosphorus equivalency values of Natuzyme P and its effect on broiler chick's performance and mineral utilization. In each experiment 160 male Ross 308 broiler chicks were used in a compleely randomized design. Treatment 1 to 4 included four graded levels of ME, Phosphorus, CP and amino acids in first to fourth experiment respectively. In all experiments, treatment 5 to 8 were the first treatment diet's added with 0.15, 0.25, 0.35 and 0.45 g/kg Natuzyme. Linear function were drived for graded levels of ME, NPP, CP and AA (diet 1 through 4) and for Natuzyme P (diet 5 through 8). The drived regression equations for ME, NPP, CP and AA were set equal with those obtained for Natuzyme P and were solved. Nutrient equivalency values for each nutrient were calculated by subtracting nutrient content of basal diet. Results showed that in all experiments increasing the level of nutrients in treatment 1 to 4 elevated chicks performance. Added enzyme to basal diets improved energy, phosphorus and amino acids utilization by broiler chickens. Estimated energy, phosphorus, crude protein, lysine, met, met+cys and theronine equivalency values of Natuzyme P were 93080 Kcal/kg, 461, 931, 60.5, 18.15, 41.9 and 46.9 % respectively. Keywords: enzyme, nutrient equivqlency, broiler chickens |