Pig meat is the most popular type of meat in Sweden (Jordbruksverket, 2003) and the estimated frequency of carriers of the RN− allele may be as high as 60–70% in the Swedish slaughter pig population (Josell, Martinsson, Borggaard, Andersen, & Tornberg, 2000). The RN mutation affects several of the precursors for the formation of HCAs, and due to hyper-accumulation of glycogen in glycolytic muscles, meat from carriers of the RN− allele exhibits markedly higher reducing sugar levels, here expressed as residual glycogen, compared to the normal meat of non-carriers