Twenty four male castrated pigs, 45.95 kg of weight live, were used to determine the minimum fecal endogenous phosphorus losses, the rate of true absorption feed and the biological availability of various phosphate sources. A complete randomized block design, with six treatments and four replicates with one animal per experimental unit, was used. The diets were based on corn and soybean meal. The phosphorus supplement of the following sources were used: dicalcium (BIC); Tapira (TAP); Patos Minas (FPM); monoammonium (MAP) e triple superphosphate (SPT) and the diet control without P supplementation (CONT). At the 7th experimental day, the animals were intravenously injected with 7.4 MBq of 32P as sodium phosphate. Samples of blood, feces and urine were collected for seven day. It was concluded that the biological availability was 71.94, 76.67, 69.49, 64.92 and 66.35% for phosphates BIC, TAP, FPM, MAP and SPT, respectively. The variables assessment showed similar responses to various sources of phosphate.
endogenous; isotopic dilution; metabolism; phosphorus; radiophosphorus; swine
