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Luminosities and uxes of the expected population of galactic gamma-raypulsars become foreseeable if physical distributions at birth and evolutivehistory are assigned. In this work we estimate the contribution of pulsar uxesto the gamma-ray background, which has been measured by the EGRET experiment onboard of the CGRO. For pulsar luminosities we select some of the most importantgamma-ray emission models, taking into account both polar cap and outer gapscenarios. We nd that this contribution strongly depends upon controversialneutron star birth properties. A comparison between our simulation results andEGRET data is presented for each model, nding an average contribution of about10%. In addition, we perform the calculation of the number of new gamma-raypulsars detectable by GLAST and AGILE, showing a remarkable di erence betweenthe two classes of models. Finally, we suggest some improvements in thenumerical code, including more sophisticated galactic m odels and di erentpopulations of pulsars like binaries, milliseconds, anomalous pulsars andmagnetars.Comment: 6 pages, 6 figures, to be published in the Proceedings of the 6th  International Symposium ''Frontiers of Fundamental and Computational  Physics'' (FFP6), Udine (Italy), Sep. 26-29, 200

CONTRIBUTION OF PULSARS TO THE GAMMA-RAY BACKGROUND AND THEIR OBSERVATION WITH THE SPACE TELESCOPES GLAST AND AGILE