%A Esther Zeltner %A Helen Hirt %T How should a hen run be structured so that it is used evenly by laying hens ? %X The aim of this study was to obtain an even use of the hen run with structures as an uneven use leads to a nutrient and heavy metal overload on the frequently used areas. In particular, we looked at the preference of hens for a certain kind and amount of structuring elements. %D 2004 %K poultry, hen run, structuring elements, Biogefl?gelhaltung, Gr?nauslauf, Strukturierung %L orgprints6461