Genes encoding phytases have been cloned from diverse sources and characterized which include Aspergillus ficuum (Ullah 1988), Escherichia coli (Greiner et al. 1993) and a mammalian phytase (Craxton et al. 1997).
Maize grain is a main feed grain and a trendy aspect of animal feed where it is used as a supply of strength. An vital constituent of seeds of pulses and cereals in conjunction with maize is phytic acid (myo-inositol 1,2,3,4,5,6-hexakisphosphate; Ins P6).The salt shape, phytate, is the primary garage shape of phosphate accounting for more than 80 % of the whole phosphorus in cereals and legumes. Beneath normal physiological situations phytic acid chelates crucial minerals which incorporate calcium, magnesium, iron and zinc. Phytic acid likewise ties to amino acids and proteins and hinders stomach related digestive enzymes (Pallauf and Rimbach, 1996). Ruminants are promptly ready to process phytate due to the phytase created by rumen microorganisms. Phytases (myo-inositol hexakisphosphate phosphohydrolases) hydrolyze phytic corrosive into less phosphorylated myo-inositol subordinates), discharging inorganic phosphate. However, phytate is taken into consideration to be an anti-nutritive compound for monogastric animals as phosphate in phytate shape aren’t bio-to be had as these animals do no longer produce phytase enzyme required to put off phosphate from the inositol within the phytate molecule. To conquer this, supplemental inorganic phosphate is introduced to their feed to fulfill the phosphate requirement and to make sure most beneficial growth. In any case, supplemental inorganic phosphate, for example, monocalcium phosphate or dicalcium phosphae does not expel the counter nutritive impact of phytic corrosive. This may be circumvented with the aid of supplementing feed with phytase enzyme (Simell et al. 1989). Therefore, phytase has become an important industrial enzyme and several commercial products (such as Ronozyme NP, PhyzymeXP, Natuphos) are available for feed-supplementation. However, supplementation of phytase enzyme in animal feed is expensive. Enhancing inorganic P content in grains through breeding is an an alternative and cheaper strategy. This includes, developing crop varieties with reduced level of phytic acid by exploring the naturally available variability through conventional plant breeding strategies (Cichy and Raboy 2008) or engineering crops to express phytase in their seeds (Raboy et al. 2000). Genes encoding phytases have been cloned from diverse sources and characterized which include fungal phytase from Aspergillus ficuum (Ullah 1988), bacterial phytase from Escherichia coli (Greiner et al. 1993) and a mammalian phytase (Craxton et al. 1997).