Proper management of the breeding herd leads to an increase in output of pigs throughout subsequent stages of production. Re-defining amino acid requirements for high producing sows in gestation will lead to maximized productivity and efficiency. Therefore, the effect of lysine level (below and above NRC, 1988) in the gestation diet on sow performance was determined. Total lysine intakes greater than 10.6 g/d (8.3 g Dlys/d) in gestation did not improve sow productivity in the present study.