A Comparison Between the First Iranian Commercial Phytase and an Imported Phytas on the Performance, Blood Parameters and Nutrient Digestibility of Male Broiler Chicken Fed Different Dietary Phosphorous Levels

To study the effect of two types of phytase supplementation in 3 levels on performance, blood parameter and nutrient digestibility of male broiler chickens fed diets containing 2 level of phosphourous in a completely randomized design (CRD) experiment with 2×2×3 factorial arrangement and 4 replicates per treatment, 400 Ross male broiler chicks in a 45 days period were evaluated. Treatments were 2 levels of phosphorous (100% of requirement and 80% of requirement), 2 type of phytase supplementation (Iranian and Imported one) and 3 levels of phytase supplementation (0, 500 and 750 FTU). The diet formulated based on 2007 ROSS manual company. Phytase supplementation improved feed intake, feed conversion ratio, phosphorous and fat digestibility during the whole brooding period (P<0.05). Moreover, phytase supplementation increased relative weight of heart, pancreases, breast, tight and spleen (P<0.05). However, increased diets phosphorous level caused increases in blood phosphorous and decreased in blood calcium, similarity decreases in amino acid and fat digestibility (P<0.05). The results suggested that no difference observed between enzyme types (Iranian vs. Foreign one). Otherwise, Phytase supplementation at level of 750 FTU improved performance, phosphorous and fat digestibility. In the other hand phytase supplementation coudn’t compensates low phosphorous treatment affection.