With increased feed costs more producers are including byproducts as part of their diet formulation. DDGS is commonly used and the nutrient value can vary greatly, making it important to have a consistent source. Switching to a diet with byproducts should be done gradually otherwise there may be an impact on ADG. The iodine value measures unsaturated fatty acids, which in turn indicate fat firmness. DDGS can have an impact on IV, and also on carcass yield. To avoid reduced carcass yield, it is recommended to stop feeding byproducts several weeks before market. Extra care should be taken before feeding byproducts to sows. The feed should be free of mycotoxins, and the same ingredients should be used for gestation and lactation diets. Finally, when mixing a diet it is important to not overload the mixer, as this could cause uneven distribution of amino acids and additives.