An experiment was conducted to determine the effects of altering the omega-6 (n-6) to omega-3 (n-3) fatty acid (FA) ratio in sow diets on their reproductive performances. Production in the farrowing room was optimal when sows consumed a plant oil based ratio of 5:1 n-6:n-3. The long term feeding of sows with varied dietary n-6 and n-3 fatty acids can affect her reproductive performances, and the performance of her offspring.