To limit the use of mineral phosphates, there is an increased interest to feed phosphorus levels allowing maximized growth, without fulfilling the higher requirement for maximised bone mineralisation to growing pigs. In some contexts of production, replacement gilts are raised with fattening pigs until 80-100 kg BW. Considering that bone mineralization of replacement gilts should be maximized to expect a high lifetime breeding performance, the application of such a feeding strategy requires a better knowledge about the animal’s capacity to mobilise and store bone mineral reserves of calcium and phosphorus. Temporal kinetics for bone mineralisation require non-invasive methods, such as dual energy X-ray absorptiometry to allow repeated measures on the same animal. This presentation aims: 1) To verify the accuracy of dual energy X-ray absorptiometry to replace classical invasive measurements for calcium and phosphorus status, such as chemical and mechanical bone traits using data from our piglet and growing pig experiments. 2) To present new data about the modulation of bone mineral content in replacement gilts between 60 and 140 kg body weight in response to a depletion-repletion period of dietary calcium and phosphorus. The response of regions of interests reflecting different bone types such as spongious vertebrae, longitudinal bones from the foot or the head will also be highlighted. Briefly, 1) The accuracy of DXA to estimate chemical and mechanical traits was higher in data from dissected bones than from non-dissected feet. 2) Replacement gilts were able to recover their bone mineralisation by 140 kg body weight after having received a diet low in calcium and phosphorus between 60 and 100 kg BW and the depleted diet did not result in any detrimental effects on growth performance. Dietary strategies to limit the use of mineral phosphates in growing-finishing pigs thus seem to be compatible with raising replacement gilts thanks to their high homeostatic regulation capacity.