Spring pasture is changing: Is your horse ready?

Spring brings longer days, warmer temperatures and fresh green paddocks. For many horse owners, it’s one of the most enjoyable times of the year, with more opportunities for riding, turnout and grazing.

However, while lush spring pasture might look like the perfect environment for your horse, rapid grass growth can introduce some unexpected health risks.

Changes in pasture quality, sugar levels and grazing habits can affect your horse’s digestive health, weight and even hoof condition. Understanding these seasonal changes can help you make informed decisions about your horse’s wellbeing.

Here’s what every horse owner should know about managing spring pasture safely.

Why does spring grass affect horses differently?

During spring, rising temperatures, increased sunlight and seasonal rainfall encourage pasture growth. As grass develops, its nutritional composition can change significantly.

Fresh spring grass can contain elevated levels of non-structural carbohydrates (NSCs), including sugars, starches and fructans.

While carbohydrates provide energy, excessive intake can be problematic for certain horses, particularly those prone to metabolic conditions.

According to equine veterinarian Dr Stacey Oke’s article in The Horse, pasture sugar concentrations vary depending on factors such as the season, grass species, weather conditions and plant growth. These variations are particularly important for horses with insulin dysregulation or a history of laminitis.

For susceptible horses, even seemingly small changes in grazing conditions may require adjustments to their management routine.

1. Be aware of the increased risk of laminitis

One of the most important considerations during spring is laminitis, a painful condition affecting the sensitive tissues within a horse’s hooves.

Laminitis can develop for several reasons, but horses experiencing insulin dysregulation may be particularly vulnerable when consuming pasture rich in sugars.

Horses potentially at greater risk include those with:

• A previous history of laminitis

• Equine metabolic syndrome (EMS)

• Insulin dysregulation

• Pituitary pars intermedia dysfunction (PPID), commonly associated with equine Cushing’s disease

• Excess body condition or a tendency to gain weight easily

Early warning signs of laminitis may include reluctance to move, shortened or stiff strides, shifting weight between feet, increased digital pulses and warm hooves.

If you suspect laminitis, contact your veterinarian immediately and keep your horse off pasture while awaiting veterinary advice.

Equine veterinarian Dr Nancy Loving discusses the relationship between metabolic health and laminitis, highlighting the importance of managing diet and pasture access for vulnerable horses.

2. Introduce fresh pasture gradually

After spending winter grazing on slower-growing pasture or relying primarily on hay, horses may need time to adjust to increased access to fresh spring grass.

Suddenly allowing unrestricted grazing can result in a substantial change in dietary intake, potentially contributing to digestive disturbances and increased risk of colic.

A gradual transition allows owners to monitor their horse’s response while managing the amount of fresh grass consumed.

The University of Minnesota Extension recommends introducing horses to established spring pasture gradually, beginning with short grazing periods and increasing access over several weeks.

For healthy horses, this might involve starting with approximately 15 minutes of grazing and extending the duration progressively. However, this approach is not suitable for every horse, particularly those with metabolic conditions.

Consider the following precautions:

• Introduce grazing gradually rather than allowing immediate unrestricted access.

• Maintain suitable forage during the transition.

• Monitor manure consistency, appetite and behaviour.

• Speak with your veterinarian before increasing grazing for horses with previous metabolic or digestive issues.

Every horse has different dietary requirements, so a grazing plan should reflect their individual health and nutritional needs.

3. Understand how weather affects grass sugar levels

Not all spring pasture carries the same nutritional profile.

Grass sugar concentrations can fluctuate throughout the day and in response to changing environmental conditions.

For example, sunny conditions can encourage sugar production through photosynthesis, while cold temperatures may slow the plant’s ability to use stored carbohydrates for growth.

This means certain combinations of sunshine, cool nights, frost and stressed pasture can result in higher sugar concentrations.

For horses particularly sensitive to dietary sugars, grazing during these periods may require additional restrictions.

Although early morning grazing is sometimes recommended under suitable conditions, there is no universally safe grazing time. Recent frosts, weather patterns and grass species can all influence pasture sugar levels.

Owners managing horses with insulin dysregulation or previous laminitis should seek veterinary advice rather than relying on the time of day alone.

4. Keep an eye on your horse’s weight

Spring grass can provide considerable nutritional value, which is beneficial for some horses but challenging for those that gain weight easily.

When pasture becomes more abundant, horses may consume additional energy without a corresponding increase in exercise.

Over time, this can contribute to unwanted weight gain.

Regularly assessing your horse’s body condition can help you identify changes before they become more significant.

Some useful management strategies include:

• Monitoring body condition scores and using a weight tape consistently

• Reviewing grazing access as pasture growth increases

• Maintaining an appropriate exercise routine where suitable

• Considering a grazing muzzle under professional guidance

• Discussing dietary adjustments with your veterinarian or qualified equine nutritionist

Remember that restricting pasture doesn’t mean restricting essential nutrition. Horses still require adequate forage, water and a balanced diet.

For horses with specific metabolic conditions, an individually tailored feeding plan is particularly important.

5. Inspect paddocks for seasonal hazards

While grass growth deserves attention, spring is also an excellent time to review the overall safety of your horse’s environment.

Seasonal rainfall and new plant growth can change paddock conditions, sometimes introducing hazards that were not present during winter.

Take time to check for:

• Toxic plants and weeds emerging among pasture grasses

• Broken fencing, loose wire or damaged gates

• Waterlogged ground, uneven footing and slippery areas

• Unsecured equipment or debris

• Changes to water availability or trough cleanliness

Some plants become particularly hazardous when damaged or wilted, so identifying potentially toxic vegetation is an important part of routine pasture maintenance.

Regular paddock inspections can help you identify risks before they affect your horse.

6. Watch for changes in behaviour and movement

Your horse’s behaviour can provide useful clues about their health, particularly when their diet or environment has recently changed.

During spring, pay attention to changes in:

• Appetite or drinking habits

• Manure consistency and frequency

• Willingness to move or exercise

• Hoof sensitivity or unusual weight shifting

• General behaviour, comfort and energy levels

Signs of colic may include repeated pawing, looking towards the abdomen, attempting to roll, reduced appetite or unusual restlessness.

Similarly, subtle stiffness or reluctance to walk may indicate discomfort that requires veterinary assessment.

If your horse displays symptoms of colic, laminitis or another sudden illness, seek veterinary attention promptly.

7. Review your horse’s health and protection for spring

Spring is a useful opportunity to review your horse’s overall health management routine.

Alongside reviewing grazing arrangements, consider whether vaccinations, dental examinations, hoof care and parasite management are up to date.

It is also worth thinking about how you would manage unexpected veterinary expenses.

Even with careful preparation, horses can experience sudden illness or injury that requires veterinary investigation, treatment or ongoing care.

Depending on the circumstances, these expenses can quickly become significant.

Petcover horse insurance can help provide financial protection against eligible unexpected veterinary expenses, depending on the cover selected.

With optional veterinary fees cover for injury and illness, Petcover offers horse owners an opportunity to consider protection suited to their horse’s needs.

Explore Petcover Horse Insurance and prepare for the unexpected.

A healthier spring starts with preparation

Spring pasture brings plenty of benefits, from fresh grazing opportunities to more time spent outdoors with your horse.

However, rapidly changing grass conditions mean it is important to approach the season with care.

By gradually adjusting grazing routines, monitoring body condition, understanding laminitis risks and checking paddock safety, you can help your horse enjoy the warmer months more comfortably.

Every horse responds differently to seasonal changes. If you’re unsure about your horse’s dietary requirements or grazing suitability, your veterinarian is the best person to help develop an appropriate management plan.

A little preparation now can make a meaningful difference to your horse’s health throughout spring and beyond.

References

Dr Stacey Oke | Dr Nancy S. | University of Minnesota Extension