This experimentwas conducted to determine the requirement of available phosphorus (aP) forpigs kept in hot environment. Seventy-two pigs (36 castrated males and 36 females)with initial weight of 15.10±0.31 kg were allotted in a completely randomizedblock design with six treatments (0.107, 0.214, 0.321, 0.428, 0.535, and 0.642%of aP), six replicates and two pigs (1 castrated male and 1 female) per experimentalunit. Pigs were kept in a hot environment with temperature of 34.1±0.8ºC. The levels of aP influenced the daily weight gain, which increasedquadratically up to the estimated level of 0.477%, and feed conversion, whichimproved quadratically up to the estimated level of 0.457%. The levels of aPalso influenced the content of phosphorus in the bone, which increased quadraticallyup to the estimated level of 0.529%. The available phosphorus requirement of15- to 30-kg pigs kept in a hot environment, for the best results of daily weightgain, feed conversion and bone parameters are 0.477, 0.457, and 0.529%, correspondingto the estimated daily available phosphorus intakes of 4.75; 4.55 and 5.27 g,respectively.
