TY - JOUR JO - Journal of Animal and Feed Sciences J2 - J. Anim. Feed Sci. SN - 1230-1388 VL - 13 IS - 2 PY - 2004 ID - Karaman2004 TI - Study on stability of fungal phytase as poultry feed additive AB - Stability of phytase enzyme from Aspergillus niger against different pH values and proteases was studied to reveal its potential as poultry feed additive. Phytase enzyme lost approximately 53, 32, 66, and 87% of its activity at pH 1, 2, 8, and 9, respectively, but the enzyme was able to recover full activity at pH 5.5 following 6 h of exposure at 37°C to pH as low as 3. Pre-treatment of phytase enzyme with saliva for an hour resulted in lose of enzyme activity about 10%, and similarly treatment with proteases caused about 40% decrease of activity. Addition of phytase enzyme to the low phosphorus containing diets kept the tibia ash content constant. Supplementation of diet with phytase enzyme increased availability of total phosphorus. Phytase supplementation of broiler diets also improved growth and body weights and decreased mortality. AU - Karaman, M. AU - Gurbuz, Y. AU - Ozkose, E. AU - Ekinci, M. S. SP - 313 EP - 321 DA - 2004 DO - 10.22358/jafs/67415/2004 UR - https://doi.org/10.22358/jafs/67415/2004 ER -