Linseed is fed in various forms and doses. Lower doses of linseed were examined by Matthews et al. (2000) (50 g of whole linseed per kg), Riley et al. (2000) (10, 20, and 30 g of linseed per kg), Kouba et al. (2003) (60 g of whole crushed linseed
per kg) or Corino et al. (2008) (50 g of extruded linseed per kg). Higher doses of linseed were mentioned in studies of Juárez et al. (2009) (150 g of co-extruded flaxseed per kg) or Bečková and Václavková (2010) (134 g of ground linseed per
kg). Based on results of Juárez et al. (2009) and other studies revealing that pigs can be fed up to 15% linseed without affecting performance, there was examined a dose of 150 g of crushed linseed per kg in gilts and barrows.