EXIGÊNCIAS DE FÓSFORO DISPONÍVEL PARA AVES COM O USO DO FOSFATO MONOAMÔNIO

The objective of this work was to evaluate the phosphorous requirements (Pd) when monoammonium phosphate (MAP) is used as a phosphorous (P) source for broilers in the starter phase (1 to 21 days). We used 800 male chicks at one day old, in a 5x2 factorial arrangement, with five Pd levels (0.28, 0.34, 0.40, 0.46 and 0.52%) and two Ca levels (1.00 and 0.60), totaling ten treatments and eight replicates. Significant interaction was observed between the phosphorus and calcium levels from the diet, in the performances traits, bone ashes and P retention and excretion. Utilizing the level of 1.0% Ca in the diet, the best results of performance and bone ashes were founded when the levels of 0.42% and 0.439% Pd were used, respectively. Better contents of bone ashes were observed with the use of 0.60% Ca in the diet only when the lowest level of P was used. When the MAP was utilized as a source of P in the diet for broilers in the starter phase, the use of the 0.43% of Pd and 1.00% of Ca is enough to promote better performance and bone mineralization. KEYWORDS: bone mineralization; broiler; performance; phosphorus source.