This study examined the patterns of nitrogen retention in gestating sows, and protein deposition with varying energy intake. Sows were fed 15% above or 15% below recommended energy intake, and N-balance was determined five times during gestation. Protein deposition was significantly higher when energy intake was higher, as stated in NRC (2012), but protein deposition levels were lower than predicted by NRC. By accurately determining nutritional requirements throughout gestation, sow needs can be more accurately met and costs saved by reducing nutrient loss.