Immunization against gonadotropin-releasing factor (IM) in market gilts results in predictable secondary effects on growth performance and carcass composition. Feed intake has been shown to be higher after the second week of 2nd application of immunological product (V2), resulting in faster growth and greater carcass fat deposition (1). This research aimed to evaluate the effects of three timings of immunization and two feeding programs on fatty acid profile of gilts.