This research paper determines how soluble (SF) and insoluble fibre (ISF) effects energy digestibility, Nitrogen balance, and digestibility. It was concluded that increased intake of insoluble firbre decreased energy digestibility, whereas increasing soluble fibre improved energy digestibility. The diet had not effect on nitrogen retention. Insoluble fiber digestiblity improved when SF intake increased, which suggests that knowledge of specific dietary fiber components is necessary to predict effeects of dietary firbew on digestibility.