The current Experiment will study the effects of the use of Natuphos R at three dose Levels (500, 1.500 and 3.000 FTU) supplemented in a diet containing phytate in comparison with a diet free of phytate, in weaned iglets from 25 until 52 days of age. We will explore the possible mechanisms beyond the effect of the high doses of phytase in the growth of piglets while having mucosa and associated tissues in Focus.