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The Iberian pig has been asociated traditionally with outdoors production systems. The morphologycal, etologycal and physiological characteristics of Iberian pig are adapted to take full advantage of mediterranean ecosystem from the SouthWest of Spain. The economic peak of Iberian pig sector have prompted more intensification in the farms. Now most of the farms find alternative production systems compatibles with the natural environment and animale welfare. In this research we have been performed to measure the productivity in three different rearing systems: outdoor system, traditional system and intensive system with farrowing crate. Our subject were thirty six Iberian sows, divide in three sets of twelve animals each one. A total of four suckilng periods data were collected, for two years to value different productive index: piglet born alive, piglet weaned alive, percentage perinatal survival percentage, suckilng period survival percentage and daily average gain. The intensive rearing system showed the higher percentage of perinatal survival (87, 7%). The outdoor system offered the best lactation survival rate (79%). The dairy average gain for piglets was higher in outdoor system. In conclusion, the most productive system was the intensive system with a higher farrows medium weight.