It was used 72pigs, 36 castrated males and 36 females, with initial weight of 14.97 ±0.36 kg to evaluate levels of dietary available phosphorus (aP). The animalswere distributed in a completely randomized block design, with six levels ofaP (0.107; 0.214; 0.321; 0.428; 0.535 and 0.642%), six replicates and two animals(one castrated male and one female) per experimental unit. Air temperature andrelative humidity in the room were kept at 24.5 ± 1.2°C and 76.3± 8.5%, respectively. The levels of aP influenced both daily feed intakeand daily weight gain, which increased in a quadratic way up to the estimatedlevels of 0.420% and 0.443%, respectively and feed conversion, which improvedin a quadratic manner up to the estimated level of 0.461%. It was observed theeffects of levels of aP on quantity of phosphorus and ash in the bone, whichincreased in a quadratic manner up to the estimated levels of 0.525% and 0.520%,respectively. Levels of Ap affected daily protein deposition in the carcass,which increased in a quadratic way up to the estimated level of 0.394%. Therewas no effect of levels of aP on daily fat carcass deposition. Levels of aPthat provided the best results for daily weight gain, feed conversion and bonemineralization in swines with high genetic potential for lean meat kept in thermoneutralenvironment, from 15 to 30 kg are 0.443, 0.461 and 0.525%, respectively, correspondingto estimated daily intakes of 5.25, 5.45 and 6.14 g of aP.
