Vaz ACN, Albuquerque R de, Brisola ML, Donato DCZ, Garcia PDSR. Effect of phytase supplementation with different levels of crude protein and available phosphorum on performance and crude protein excretion of broiler chickens. Braz. J. Vet. Res. Anim. Sci. 2009;46(2):107-111. doi:10.11606/issn.1678-4456.bjvras.2009.26756