EN
In comparing literature data an attempt was made to determine whether the lowering of glucosinolates (GLS) content in improved rapeseed cultivars is sufficient and whether the noxious products of the hydrolysis of these compounds, i.e. isothicyanians (ITC), viny, -oxazolidinotion (VOT-goitrin), nitriles and thiocyanate ions pose a threat for animal performance and productivity. The GLS threshold in fodder mixes was accepted as 2 to 4 μM/g for various production groups of pigs, 0,5 to 1,5 μM/g for poultry and 6 and 15 μM/g for calves and cattle, respectively. A conclusion was drawn that in spite of radical reduction of GLS content in improved rapeseed cultivars to 10-20 μM/g this group of compounds remains an important antinutritional component in feeding monogastrics. The presence of these compounds may limit fodder use of rapeseeds and press-cake obtained by cold oil pressing. In the case of cultivars of very low GLS content (below 5 μM/g) other components, mainly high content of fibre and phenolics, limit the use of rapeseeds, press-cake and post-extraction meal in the food rations of intensively fed animals.