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Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-27T11:24:32Z No. of bitstreams: 0Bitstream added on 2014-05-27T14:30:34Z : No. of bitstreams: 1 2-s2.0-77954253884.pdf: 56860 bytes, checksum: 0fb21a95dd51dda41512c0b536571fef (MD5) Made available in DSpace on 2014-05-27T11:24:32Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-12-01 It was evaluated the effect of nonphytate phosphorus (NNP) and phytase on broiler tibia. One thousand and two hundred chicks were allocated in a completely randomized design and factorial arrangement 4 x 3 (NPP x phytase levels), with four replicates. NPP levels, at each phase, were 0.45, 0.37, 0.29 and 0.21% - initial, 0.41, 0.33, 0.25 and 0.17% - growth, and 0.37, 0.29, 0.21 and 0.13% - withdrawal. Phytase levels were 0, 500 and 1000 FTU/kg of diet. There was no effect on diameter at 21 days of age. Tibia with lower weight, length and diaphysis, distal epiphysis and average densities e proximal epiphysis density resulted from NPP reduction from 0.37 to 0.29% and from 0.29 to 0.21%, respectively. Inclusion of 500 FTU/kg of phytase improved length and diaphysis density of the tibia, independent of NPP levels. Diets with NPP, at initial, growth and final phases, of 0.37, 0.33 and 0.29%, respectively, supplemented with 1000 FTU/kg of phytase, can be used with no negative effect on bone quality in broilers. Universidade de Rio Verde UNESP, Ilha Solteira UNESP, Jaboticabal UNESP, Ilha Solteira UNESP, Jaboticabal