Grazing is the act of a horse feeding on grass and low-growing vegetation directly from the ground. It is the most natural feeding behaviour for horses, one they are physiologically built to perform for the majority of their waking hours. Understanding how horses graze — and managing that access carefully — is fundamental to their health, digestive function, and mental well-being.
The Biology of Horse Grazing
Horses are non-ruminant herbivores with a digestive system designed for continuous, low-volume forage intake rather than large, infrequent meals. The equine stomach is relatively small, holding around 8 to 15 litres, and empties quickly. Acid is produced continuously regardless of whether the horse is eating, which means prolonged periods without forage can lead to gastric ulcers and digestive discomfort.
In the wild, horses graze for 16 to 18 hours per day, covering several kilometres as they move between grazing patches. This constant trickle of fibre keeps the hindgut functioning correctly, supports healthy gut motility, and buffers stomach acid. Domesticated horses with restricted turnout or hay access lose this natural rhythm, which is why managing grazing — rather than simply eliminating it — is the more physiologically sound approach for most horses.
Pasture Quality and Nutritional Content
Not all horse grazing is equal. The nutritional value of grass changes with the season, species present, soil health, and management practices. Spring and early summer pasture in the UK is typically lush and high in non-structural carbohydrates (NSCs), including fructans and sugars, which can cause problems for horses with metabolic conditions such as laminitis or equine metabolic syndrome.
Horses grazing on well-established, mixed-species pasture with a variety of grasses and broad-leaved plants will generally obtain a more balanced diet than those on rye-grass monocultures, which can be excessively rich. Regular soil testing and appropriate fertilisation help maintain pasture quality without creating overly lush growth that poses health risks.
Managing Horse Grazing
Practical grazing management involves balancing the horse’s welfare needs with the health of the land. Key approaches include:
Strip grazing: Using temporary electric fencing to offer horses a fresh section of pasture at a time, preventing overgrazing and allowing previously grazed areas to recover.
Dry lots and sacrifice paddocks: Keeping horses off grass entirely during high-risk periods — particularly in spring and autumn when fructan levels peak — whilst still providing adequate hay or haylage. See also: haylage for horses for alternative forage options.
Grazing muzzles: Allowing horses onto pasture whilst restricting intake, particularly useful for good doers and those with metabolic conditions. Research indicates muzzled horses can still consume around 30% of normal intake, which helps maintain gut function.
Rotational grazing: Dividing a field into sections and rotating horses between them to allow rest and recovery periods, improving long-term pasture health and reducing parasite burden.
Grazing and Mental Well-Being
Beyond nutrition, turnout and grazing time are critical for a horse’s psychological health. Horses are social, movement-oriented animals, and restricting them to stables for extended periods can contribute to stress behaviours, including weaving, box walking, and crib-biting. Even limited daily grazing — a few hours in a paddock — can significantly improve mood, reduce cortisol levels, and support better behaviour under saddle.
For horses in regular work, combining structured exercise with adequate grazing time produces more relaxed, cooperative horses than those kept predominantly stabled. The two are not in competition; managed correctly, they complement each other.
For further reading on horse care and nutrition, see the BHS guidance on pasture management at bhs.org.uk.
Frequently Asked Questions
How many hours a day should a horse graze?
Ideally, horses should have access to grazing or forage for a minimum of 16 hours per day to mimic their natural feeding pattern. In practice, full 24-hour turnout is not always possible, but owners should aim to supplement time off grass with ad-lib hay or haylage to ensure the horse’s gut remains active throughout the day and night.
Can too much grazing harm a horse?
Yes. Unrestricted access to lush pasture, particularly in spring, can cause laminitis in susceptible horses due to high levels of fructans and sugars in the grass. Horses that are overweight, insulin-resistant, or have a history of laminitis should have their grazing carefully managed. Consult your vet and a qualified equine nutritionist if you are unsure how much grazing is appropriate for your horse.
What is the difference between grazing and browsing in horses?
Grazing refers specifically to eating low-growing grasses and plants from the ground. Browsing, by contrast, involves eating leaves, bark, and shrubs from trees or taller vegetation. Horses do both, though they are predominantly grazers. Access to hedgerows and mixed forage can enrich a horse’s environment and provide a broader range of nutrients.