This research paper investigates the digestion of carbohydrates and utlization of energy in sows fed diets with different levels and physicochemical properties of dietary fibre (DF). It was shown that the DF level influenced the ileal flow of most nutrients, in particular carbohydrates. Feeding HF diets resulted in greater CH4 production, which was related to the amount of carbohydrates and OM fermented in the large intestine, but with no difference in heat production.