1. Abelson, P.H. 1999. A potential phosphate crisis. Science, 283: 2015. [
DOI:10.1126/science.283.5410.2015]
2. Ahmad, T., Sh. Rasool, M. Sarwar, A. Haq and Z. Hasan. 2000. Effect of microbial phytase produced from fungus Aspergillus niger on bioavailability of phosphorus and calcium in broiler chickens. Animal Feed Science and Technology, 83: 103-114. [
DOI:10.1016/S0377-8401(99)00122-4]
3. Augspurger, N.R., D.M. Webel, X.G. Lei and D.H. Baker. 2003. Efficacy of e.coli phytas expressed in yeast for releasing phytate-bound phosphorus in young chicks and pigs. Journal of Animal Science, 81: 474-483. [
DOI:10.2527/2003.812474x]
4. Bahadoran, R., A.A. Gheisari and M. Toghyani. 2011. Effects of supplemental microbial phytase enzyme on performance and phytate phosphorus digestibility of a corn-wheat-soybean meal diet in broiler chicks. African Journal of Biotechnology, 10(34): 6655-6662.
5. Bayley, H.S., J.D. Summers and S.J. Slinger. 1968. The effect of steam pelleting feed ingredients on chick performance:Effect on phosphorus availability, metabolizable value and carcass composition. Poultry Science, 47: 1140-1148. [
DOI:10.3382/ps.0471140]
6. Behnke, K.C. 1994. Factors affecting pellet quality. Conference maryland nutrition dept. of poultry science and animal science, college of agriculture, university of Maryland college park.
7. Cabahug, S., V. Ravindran, P.H. Selle and W.L. Bryden. 1999. Response of broiler chickens to microbial phytase as influenced by dietary phytic acid and non-phytate phosphorus levels. British Poultry Science, 40: 660-666. [
DOI:10.1080/00071669987052]
8. Cavalcanti, W.B. and K.C. Behnke .2004. Effect of wheat bran phytase subjected to different conditioning temperatures on phosphorus utilization by broiler chicks based on body weight and toe ash measurements. International Journal Poultry Science, 3: 215-219. [
DOI:10.3923/ijps.2004.215.219]
9. Correll, D.L. 1999. Phosphorus: a rate limiting nutrient in surface waters. Poultry Science, 78: 674-682. [
DOI:10.1093/ps/78.5.674]
10. Ceylan, N., S. Cangir, M. Corduk, A. Grigorov and S.H. Golzar Adabi. 2012. The effects of phytase supplementation and dietary phosphorus level on performance and on tibia ash and phosphorus contents in broilers fed maize-soyabased diets. Journal of Animal and Feed Sciences, 21: 696-704. [
DOI:10.22358/jafs/66142/2012]
11. Edwards, H.M., A.B. Carlos, A.B. Kasim and R.T. Toledo .1999. Effects of steam pelleting and extrusion on phytate phosphorus utilization in broiler chickens.Poultry Science, 78: 96-101. [
DOI:10.1093/ps/78.1.96]
12. Hassanabadi, A., H. Nasiri Moghadam and J. Pourreza. 2003. Effect of microbial phytase on apparent amino acid digestibility and performance of broiler chickens. Agricultural Sciences and Technology, 18: 49-56 (In Persian).
13. Hassanabadi, A., H. Nasiri Moghadam and H. Kermanshahi. 2004. Effect of microbial phytase on apparent protein, aminoacid, calcium, phosphorus,iron and zinc digestibility of broiler chickens. Congress of the 1th. Animal Science, (In Persian).
14. Helrich, K. 2005. Official Methods of Analysis of the Association of Official Analytical Chemists (AOAC), chapter 9,18th Edition.
15. Igbasan, F.A., K. Manner, G. Miksch, R. Borriss, A. Farouk and O. Simon. 2000. Comparative studies on the in vitro properties of phytases from various microbial origins. Archives of Animal Nutrition. 53: 353-373. [
DOI:10.1080/17450390009381958]
16. Institute of Standards and Industrial Research of Iran, determining the amount of phosphorus compliant, 513 pp (In Persian).
17. Institute of Standards and Industrial Research of Iran, determining the amount of ash insoluble in HCl compliant, 414 pp (In Persian).
18. Juanpere, J., A.M. Pérez-Vendrell and J. Brufau. 2004. Effect of microbial phytase on broilers fed barley-based diets in the presence or not of endogenous phytase. Animal Feed Science and Technology, 115: 265-279. [
DOI:10.1016/j.anifeedsci.2004.02.002]
19. Mohammadbagheri, N. and R. Najafi. 2014. Study the immune system and carcass characteristics of broiler chickens fed with organic acids and phytase enzyme supplementation. Research on Animal Production, 6: 61-69 (In Persian).
20. Mousavi, A., M. Rezaei, F. Niknafs and B. Shohreh. 2010. Effects of microbial phytase on performance, carcass characteristics and phosphorus and calcium content of tibia in broiler chicks. Research on Animal Production, 1: 16-28 (In Persian).
21. Namini, B.B., Y.E. Nezhad, M. Sarikhan, A.R. Ahmadzadeh, M.H. Hosseinzadeh and B. Gholizadeh. 2012. Effects of dietary available phosphorus and microbial phytase on growth performance, carcass traits, serum minerals and toe ash content in broiler chicks. International Journal of Agriculture and Biology, 14: 435-439.
22. Ravindran V. 1995. Phytases in poultry nutrition. Proceeding australian poultry science symposium, 7: 135-139.
23. Ravindran, V., S. Cabahug, G. Ravindran, P.H. Selle and W.L. Bryden .2000. Response of broiler chickens to microbial phytase supplementation as influenced by dietary phytic acid and non-phytate phosphorus.British Poultry Science, 41: 193-200. [
DOI:10.1080/00071660050022263]
24. Ravindran, Y. and W.H. Hendriks. 2003. Effects of microbial phytase produced by solid-state fermentation on the performance and nutrient utilisation of broilers fed maize- and wheat-based diets. British Poultry Science, 44: 710-718. [
DOI:10.1080/00071660310001643697]
25. Sharpley, A. 1999. Agricultural phosphorus, water quality and poultry production: are they compatible? Poultry Science, 78: 660-673. [
DOI:10.1093/ps/78.5.660]
26. Santos, F.R., M. Hruby, E.E.M. Pierson, J.C. Remus and N.K. Sakomura. 2008. Effect of phytase supplementation in diets on nutrient digestibility and performance in broiler chicks. The Journal of Applied Poultry Research, 17: 191-201. [
DOI:10.3382/japr.2007-00028]
27. Sebastian, S., S.P. Touchburn, E.R. Chavez and P.C. Lague.1996. The effects of supplemental microbial phytase on the performance and utilization of diefary calcium, phosphorus, copper and zinc in broiler chickens fed corn-soybean diets. Poultry Science, 75: 729-736. [
DOI:10.3382/ps.0750729]
28. Selle, P.H. and V. Ravindran .2007. Microbial phytase in poultry nutrition. Animal Feed Science and Technology, 135: 1-41. [
DOI:10.1016/j.anifeedsci.2006.06.010]
29. Shaw, L., J.P. Blake and R.W. Gordo. 2010. Evaluation of commercial phytase enzymes on performance and tibia-breaking strength of male broiler chicks. Journal Applied Poultry Research. 19: 415-421. [
DOI:10.3382/japr.2009-00121]
30. Shirley, R.B. and H.M. Edwards. 2003. Graded levels of phytase past industry standards improves broiler performance. Poultry Science, 82: 671-680. [
DOI:10.1093/ps/82.4.671]
31. Simon, O. and F. Igbasan.2002. Invitro properties of phytases from various microbial origins. International Journal Food Science Technology, 37: 813-822. [
DOI:10.1046/j.1365-2621.2002.00621.x]
32. Simons, P.C.M., H.A.J. Versteegh, A.W. Jongbloed, P.A. Kemme, P. Slump, K.D. Bos, M.G.E. Wolters, R., F. Beudeker and G.J. Verschoor .1990. Improvement of phosphorus availability by microbial phytase in broilers and pigs. British Journal Nutrition, 64: 525-540. [
DOI:10.1079/BJN19900052]
33. SAS Institute, 2000. SAS User's Guide: Statistics. 8th Edn. SAS Institute Inc., Cary, NC. ISBN: 10:158025599X, pp: 576.
34. Tang, H.O., X.H. GAO, F. Ji, S. Tong and X.j. Li .2012. Effects of a thermostable phytase on the growth performance and bone mineralization of broilers. Journal of Applied Poultry Research, 21: 476-483. [
DOI:10.3382/japr.2011-00348]
35. Viveros, A., C. Centeno, A. Brenes, R. Canales and A. Lozano.2000. Phytase and acidphosphatase activities in plant feedstuffs.Journal Agricultural Food Chemistery, 48:4009-4013. [
DOI:10.1021/jf991126m]
36. Warden, W.K. and P.J. Schaible.1962. Preliminary investigation concern in utilization of phytin phosphorus by the chick. Poultry Science, 41:1692 (Abstract). [
DOI:10.3382/ps.0410725]
37. Watson, B.C., J.O. Matthews, L.L. Southern and J.L. Shelton .2006. The effects of phytase on growth performance and intestinal transit time of broilers fed nutritionally adequate diets and diets deficient in calcium and phosphorus. Poultry Science, 85: 493-497. [
DOI:10.1093/ps/85.3.493]
38. Woyengo, T.A., B.A. Slominski and R.O. Jones. 2010. Growth performance and nutrient utilization of broiler chickens fed diets supplemented with phytase alone or in combination with citric acid and multicarbohydrase. Poultry Science, 89: 2221-2229. [
DOI:10.3382/ps.2010-00832]
39. Zyla, K., J. Koreleski, S. Swiatkiewicz, J. Piironen and D.R. Ledoux .2001. Influence of supplemental enzymes on the performance and phosphorus excretion of broilers fed wheat-based diets to 6 weeks of age. Animal Feed Science Technology, 89: 13-118. [
DOI:10.1016/S0377-8401(00)00227-3]