Due to their high energy concentration, fats and oils are commonly added to the feed
to fulfill these requirements. The digestibility of fat and oils, however, depends on their chemical and physical characteristics. The impact of the degree of saturation
of fatty acids and their chain length on ME has been well-documented in broilers (Wiseman and Salvador, 1991; Blanch et al., 1996; Sanz et al., 2000; Villaverde et al. 2006; Smink et al., 2010).