ORIGINAL PAPER
Study on stability of fungal phytase as poultry feed
additive
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Kahramanmaras Sutcu Imam University, Faculty of Agriculture,
Department of Animal Science,
46060 Kahramanmaras, Turkey
Publication date: 2004-04-09
Corresponding author
M. S. Ekinci
Kahramanmaras Sutcu Imam University, Faculty of Agriculture,
Department of Animal Science,
46060 Kahramanmaras, Turkey
J. Anim. Feed Sci. 2004;13(2):313-321
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ABSTRACT
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.
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