The research was carried out to study the kinetic of P in tissues of pigs fed rations containing organic P with the addition of different levels of phytase enzyme, using the 32P as a metabolic tracer. Twelve crossbred barrow with 31,68± 1,62kg were divided in a completely randomized design in a split plot arrangement, with four treatments (253, 749, 1265 and 1748 PU (phytase unit)/kg) and three repetitions. Treatments formed the parcels and tissues (bones, liver, heart, kidneys and muscles) the by-parcels. All pigs were kept in a metabolic cage for a seven-day period for sample collection. At the first day of the collection period, each animal was injected intravenously with 7.4 MBq of 32P. On the seventh day all animals were slaughtered and samples of tissues were collected. The phytase enzyme affected the concentration of P in kidney at the levels of 253 and 759 PU/kg.
calcium; isotopic dilution; nutrition; phytato; radionuclide
