This study was completed to determine the potential for using distillers dried grains with solubles (DDGS) in diets with or without phytase to provide available phosphorus, energy, and protein to highly productive lactating sows without increasing their fecal phosphorus. The results indicate that highly productive sows can sustain lactation performance with reduced fecal phytate phosphorus when fed DDGS and phytase in lactation diets.