Theobjective of thisstudywas to evaluatethe effect ofreducedcalcium, phosphorus, energy andamino aciddietsupplemented withphytase forbroilersin the growth phase(14 to28 days)on the ofnitrogen, calciumand phosphorus balance. We distributed392male broilersofCobb, in a completely randomizedin a factorial3 x2 + 1Reduced levelofCaandP; Reduced levels ofamino acidsand energylevelsreducedCa, P, andamino acids x with and withoutenzyme+positive control), seven treatmentswitheight replicatesof sevenchicks each. In the diets with phytasewas used 500 FTU of phytase/ kg diet.Data weresubmitted to varianceanalysisandaverages werecomparedby theF test fororthogonal contrasts. Through the results can be seen that the enzyme phytase used thus of 21,34% reduction in calcium excretion end apparent retention ratio of calcium to 20,16%. Similarly, reductions of nitrogen excretion by 7,56% and phosphorus excretion by 21,34%, the environmental impact reducing caused by the excretion of these nutrientes of these nutrientes and increasing the apparent retention ratio of 9,41 and 33,94% in average, respectively.
enzymes; excretion; metabolism