By Casey Zangaro
Pasture-based pig production continues to grow across Michigan as farms diversify livestock enterprises and meet demand for locally raised pork. Outdoor systems provide pigs with access to fresh air, forage and soil, but these environments also put pressure on the pasture. Soil conditions often determine whether a pasture pig system remains productive or becomes difficult to manage.
Michigan soils vary widely due to glacial history, drainage patterns and organic matter levels. Understanding soil characteristics and how pigs interact with pasture ground can help producers protect soil health and maintain productive grazing areas.
Michigan soils and pasture suitability
Michigan features a variety of soils, including sandy, loamy and clay soils formed by glacial deposits. Each soil type reacts differently to livestock activity. Sandy soil, common in northern and western Michigan, drains quickly and can reduce mud issues, but they often hold less water and nutrients. During dry periods, these soils may have difficulty supporting pasture growth. Heavier clay soils, found in parts of central and eastern Michigan, retain water longer and can stay saturated after rainfall or snowmelt. When pigs are kept on wet ground, the soil is more susceptible to compaction and pasture damage. Moderately well-drained loam soils generally perform better for pasture livestock because they balance drainage with moisture retention.
Pig behavior and soil disturbance
Unlike most grazing livestock, pigs naturally root while searching for food or exploring their environment. Using their snouts, pigs dig and turn over soil to locate roots, insects and other food sources. While some disturbance can incorporate organic material into soil, excessive rooting can remove vegetation and expose bare ground.
Research has shown that rooting behavior can significantly disturb soil structure and reduce plant cover in areas with frequent pig activity. Rotating pigs between paddocks and maintaining appropriate stocking density can help limit soil disturbance and promote pasture recovery.
Source : msu.edu