8Vohra A, Satyanarayana T. Phytases: microbial sources, production, purification, and potential biotechnological applications. Crit. Rev. Biotechnol. ,2003 (23) :29 -60.
9A kinm usire AS, A deo la O. True digestibility of phosphorus in canola and soybean meals for growing pigs:influence of microbial phytase. Journal of Ani- mal Science ,2009,87 (3) :977 - 983.
10Veum T L,Ellersieck M R. Effect of low doses of As - pergillus niger phytase on grow thperformance, bone strength, and nutrient absorption and excretion by growing and finishing swine fed corn-soybean mealdi- ets deficient in available phos-phoms and calcium. Journal of Animal Science,2008,86(4) : 858 - 870.
