40. Selection of a suitable site is one of the most important decisions for the outdoor pig farmer because an unsuitable site will greatly increase the potential for poor welfare. When planning a new unit it is essential that the selected site is satisfactory, including plans for future movement. The industry, together with agricultural consultants, may wish to consider the development of a computer model which should take into account factors such as stocking density, rainfall and soil type to assist in the determination of site suitability.
41. Waterlogging and poaching of the ground are the main causes of problems on unsuitable sites so, ideally, the paddocks should be in a low rainfall area on a light top-soil overlying a free-draining sub-soil with the absence of sharp stones likely to cause foot damage. A good, well-established grass sward provides additional drainage on some soil types and protects the soil should it become waterlogged which is of particular importance in farrowing paddocks. Lower stocking density and the rotation of paddocks help reduce the effects of wet weather.
42. Whilst sloping fields can aid drainage, excessive slopes should be avoided particularly for farrowing paddocks because bedding and piglets can roll in the hut increasing the risk of overlying. Sites which are susceptible to flooding should be avoided. Natural shelter is important especially in areas with a high risk of wind chill. Further information about site selection is at Appendix C.