In Fig. 1 the geographical distribution of cereals and straw sampled in 2011 and in 2012 is indicated. The maps also show the most important areas for pig farming in Sweden. Barley was the most often sampled feed grain followed by wheat, oats, mixed grain and triticale (Table 1). Of the total number of samples in the survey straw constituted approximately 42%. The species of the collected straw samples were not identified.