Genetic improvement of pigs relies heavily on improving feed conversion and controlling feed intake capacity. For this purpose it is vital to measure feed intake of individual pigs. Traditionally this has been achieved by keeping pigs singly or in sib-pairs in small pens. Such facilities are expensive to build and are difficult to design to cater adequately for pigs over a wide range of weights and at low stocking density. Keeping animals in small pens is less than satisfactory from a welfare aspect.