Nine varieties of sweet lupins, harvested in Poland during 1993 (yellow: Juno, Popiel and Amulet; white: Wat, Bardo and Hetman; narrow-leaved: Sur, Emir and Saturn), differing in the size of seeds, were dehulled by hand. The chemical composition of whole seeds, hulls and dehulled seeds were determined. The size of seeds (expressed as the weight of 1000 seeds) of white and narrow-leaved lupins was positively correlated with the cotyledons and protein and fat contents in the seeds. In all varieties about 97% of total protein and 95 to 98% of total fat contained in the seeds were found in the cotyledons, 74 to 86% of total crude fibre in the hulls. Dehulling of lupin seeds may increase their metabolizable energy content for poultry by 20 to 35%.