Two experiments were conducted to evaluate the effects of soluble (SF) and insoluble (ISF) dietary fiber during gestation on embryo survival and sow performance. It was concluded that the inclusion of SF and ISF in gestation diets did not affect litter size. Sows fed the HS+HIS diet had a greater ADFI and lost less birthweight during lactation than sows fed C. Feeding gestating sows increase levels of both SF and ISF from day 2 after breeding to day 109 of gestation, did not increase litter size.