The isolated bacterial strains were screened for protease production on alkaline agar medium comprising 10% skimmed milk, 1% yeast extract, 1.5% Na2CO3 and 2% agar. Plates containing alkaline agar medium were inoculated by bacterial strains. The inoculated plates were incubated at 37 °C for 24–48 h [15] and observed for the formation of zone of hydrolysis. The bacterial strains forming zone of skim milk hydrolysis were purified and preserved on alkaline agar medium. The formation of zone of hydrolysis by bacterial strains was considered as a positive indication of protease production by bacterial strains [7].