This study was done in Poultry Research Foundation within the University of Sydney. This study was to evaluate the efficacy of exogenous phytase in wheat-soybean meal based-diets in broiler chickens from 1 to 42 days post-hatch housed on ‘deep litter’ or conditions similar to the commercial Australian situation. The overall performance of birds in the present study was outstanding. The off-sex, male Ross 308 broilers used in this feeding study outperformed 2014 Aviagen performance objectives for weight gain by 15.9% and FCR by 15.5% from 1 to 42 days post-hatch.