Horse Welfare: Pasture Management
Horses evolved as trazeling grazers, spending 16-20 hours per day walking and grazing across varied terrain. Pasture access is central to equine welfare — providing exercise, social interaction, foraging behaviour expression, and mental stimulation. Yet poorly managed pasture also poses significant health risks, particularly for laminitis-prone individuals.
Grazing Behaviour and Natural Needs
The equine digestive system evolved for continuous, low-rate forage intake. Periods without forage (particularly over 4-6 hours) cause gastric acid accumulation, increasing gastric ulcer risk. Horses denied adequate turnout show stereotypies (crib-biting, weaving, box-walking) associated with chronic frustration and poor welfare.
Group turnout with compatible companions meets social needs — horses are highly social and isolation causes significant distress. Careful group management (compatible temperaments, equal hierarchy status where possible, sufficient space) reduces injury from social conflict while enabling beneficial social interaction.
Laminitis Risk Management
Pasture grass is a major laminitis trigger in susceptible horses and ponies. Non-structural carbohydrate (NSC) content in grass varies dramatically — highest in spring flush growth, after periods of drought-stress, in bright cold conditions, and in certain grass species. Native breeds, "good-doers," and horses/ponies with equine metabolic syndrome (EMS) or pituitary pars intermedia dysfunction (PPID) are most susceptible.
Risk mitigation strategies include: strip grazing (restricting access to small areas), using track systems (loafing tracks around pasture perimeter without access to lush central grass), muzzling during high-risk periods, avoiding turnout during peak NSC times (morning, bright cold weather), and maintaining lean body condition. These measures balance the welfare benefit of turnout against laminitis risk.
Pasture Rotation and Quality
Pasture rotation — dividing fields into sections and resting areas periodically — maintains sward quality, prevents poaching of wet areas, and allows parasite management. Resting grazed pastures interrupts strongyle lifecycle, reducing worm burdens. Mixed-species grazing (cattle or sheep alternating with horses) breaks species-specific parasite cycles.
Harrowing, topping rank grass, and reseeding bare patches maintain pasture quality and reduce ingestion of poached, contaminated, or unpalatable material.
Toxic Plants and Hazards
Ragwort (Jacobaea vulgaris) causes irreversible liver damage in horses. Removal from horse pastures is a legal obligation in Britain and a welfare imperative. Other toxic plants include yew (Taxus baccata — acutely fatal), bracken, foxglove, and hemlock. Regular pasture inspection and removal of toxic species is essential welfare management.
Winter Pasture Management
Wet winter conditions cause pasture poaching — churned, muddy ground that is both uncomfortable to stand on and risks field spread of infections (mud fever). Restricting access to sacrifice areas during winter, providing well-drained sacrifice paddocks with wood chip or sand surfaces, and maintaining gateway hard-standings reduce welfare impacts from winter poaching.