EFFECT OF ADDING HIGH LEVELS OF PHYTEASE ENZYME TO CORN SOYBEANS BASED DIETS IN THE PRODUCTION AND PHYSIOLOGICAL PERFORMANCE OF BROILERS

Abstract

: This study was conducted at the Poultry Research Station of the Livestock Research Department / Agricultural Research Department, Ministry of Agriculture in Abu Ghraib. During the period from 19 September 2017 to 30 October 2017. In this study, two hundred forty male of ROSS 308 broilers were randomly distributed into four treatments with 3 replicates per treatment and 20 chicks per replicate. The birds were fed on equal diets in the percentage of protein and metabolic energy according to the age requirements referred to in the Ross 308 index. The experimental treatments were involved: T1 was a positive control treatment with a complete nutrient requirement. T2 was negative control (with a deficient requirement for phosphorus available 0.17 aP), T3 was negative control with the addition of 1250 unit/kg of phytase enzyme, T4 negative control with the addition of 2500 unit/kg of phytease enzyme. The results of the present study showed a significant increase (P <0.05) in the body weight, average weight increase and the feed consumption rate of T1 compared to the negative control treatment. A significant increase (P <0.05) was observed in the mentioned characteristics of the two treatments. The results of the study also showed a significant increase (P <0.05) in the feed conversion coefficient of the negative control treatment (NC) compared to the positive control treatment (PC). The two treatments of the phytase enzyme were significantly (P <0.05) reduced FCR in NC and there was no significant difference between the addition coefficients and PC. As for the percentage of mortality, the results of the study did not show any significant difference between the experimental treatments. The higher concentration of the ALP enzyme in NC compared to PC was noted as well as ALP was significantly (P<0.05) reduced in T3 while a significant decrease was detected in T4 compared to the other treatments. As for the level of phosphorus in the blood, the percentage of thigh ash and the percentage of ash phosphorus showed a significant decrease (P <0.05) in the NC compared to the PC. A significant increase (P <0.05) in T3 and T4 to a level close to the PC was revealed in addition, there are no negative effects of addition of the enzyme in the production and physiological performance of broilers.