87. A wide range of different designs of farrowing hut have been seen on the outdoor units visited. There is no clear agreement about the optimum size or design required to ensure that the hut allows the sow to exhibit her normal behaviour, whilst offering the best protection and conditions for the piglets. Guidance is also required on the benefits of insulation, ventilation and ease of management by stockmen. Accommodation should be designed to take account of adverse weather conditions. Badly designed huts can result in poor welfare.