Spring decisions that shape your horse’s health — and your grazing — for the rest of the year
Every spring, the same pressure builds. The grass starts moving. The hay barn looks worryingly empty. Costs are rising — more than ever. And the horses are restless after winter.
So many owners make the same decision: turn out early, graze the fields hard, and try to “get ahead” of the spring flush before laminitis hits.
It feels logical.
It feels proactive.
But from a pasture-management perspective, repeated early grazing can create problems of its own.
This isn’t about keeping horses in stables longer. It’s about shifting to proactive grazing management so that next spring you’re not facing the same panic about grass, sugar, and hay.
What early grazing actually does to the grass
When horses graze early and repeatedly, the pasture is repeatedly defoliated and has less opportunity to rebuild leaf area and root reserves before being grazed again. At this stage:
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the plant is rebuilding leaf area
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water‑soluble carbohydrates (WSC) concentrations vary with temperature, light, time of day, species, growth stage and management
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the proportion of structural fibre is generally lower in younger, less mature herbage
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repeated defoliation places pressure on the plant's ability to rebuild leaf area and maintain reserves
Repeated, intensive grazing can reduce the plant's opportunity to maintain a well-developed root system and adequate below-ground reserves.
Short grass is not necessarily low in sugar. Sward height affects how horses graze and how much forage they can harvest per bite, while the carbohydrate concentration of the plant is influenced by species, temperature, light, time of day, water availability and management. For horses at risk of laminitis, both forage composition and total intake therefore matter.
Pasture carbohydrate concentration is highly variable. Cool temperatures and later times of day can favour higher WSC concentrations, while frequent defoliation has often been associated with lower WSC and fructan concentrations. This is why grass height alone cannot be used as a proxy for sugar content (Kagan, 2022; Longland & Byrd, 2006).
Sward height also changes grazing behaviour and intake. In a study comparing autumn swards of different heights, ponies accessed short pasture more easily with grazing muzzles, and dry-matter and WSC intake varied with grazing conditions (Longland et al., 2016).
Repeated close grazing can reduce the plant's opportunity to rebuild leaf area and reserves, potentially reducing subsequent pasture productivity. That means:
- less standing forage
- potentially less summer grazing available
- greater reliance on supplementary forage
- potentially higher hay requirements
The attempt to “use up the grass” now can reduce the grass you’ll have later — and increases how much hay you’ll need to source for next winter.
Why longer, better‑recovered grass can be easier to manage
As grass is allowed to grow and recover properly, its physiology changes in ways that can affect both the pasture and the way horses graze it:
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carbohydrate allocation changes as the plant grows and responds to environmental conditions
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maturity generally increases structural fibre, which can influence bite characteristics and intake
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the proportion of structural material generally increases as herbage matures
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a well-managed sward can provide greater standing forage and more options for controlling grazing pressure
Longer grass isn't sugar-free, and height alone cannot tell you its NSC concentration. However, more mature swards generally contain more structural material and can alter bite size, grazing behaviour and total intake. For horses at metabolic risk, those intake characteristics can be important alongside the actual carbohydrate concentration of the forage.
Research shows that sward height can influence grazing behaviour and total forage intake. In ponies, differences in sward height and grazing conditions have been shown to alter dry-matter and water-soluble carbohydrate intake, meaning that the amount of NSC a horse consumes depends on both the carbohydrate concentration of the forage and how much forage it is able to harvest (Longland et al., 2016; Longland & Byrd, 2006). Grazing behaviour can also adapt when forage availability is restricted, with horses changing the amount of time they spend grazing under different pasture-management systems (Gartland et al., 2024).
This does not mean that taller grass is automatically lower in sugar or “safe”. WSC concentrations vary with species, maturity, temperature, light, time of day and management (Kagan, 2022).
For EMS/PPID horses, a taller, well-managed sward may offer useful advantages in terms of grazing behaviour and intake management, but pasture composition and actual forage carbohydrate concentration still need to be considered. Staying observant and understanding what is actually growing on your land remains essential.
This is not about stabling horses longer
The goal is not to keep horses off the land. The goal is to allow the pasture to recover and develop before grazing pressure increases.
That might mean:
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using a track or sacrifice area for a few extra weeks
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feeding hay a little longer
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delaying access to the main grazing platform
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protecting the early spring growth so it can mature
These small decisions now create:
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safer grazing
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deeper roots
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more species
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better drought resilience
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more total forage
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lower laminitis risk
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lower hay bills next winter
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better flood resilience next winter
This is proactive management, not restriction.
A new spring question for horse owners
Instead of asking:
“How soon can I get them out?”
the more useful question is:
“Is the pasture biologically ready — and is my horse metabolically safe — to start the grazing season?”
When you change the question, the whole system changes.
What this means for next year
If you protect your spring grazing now, next April looks very different:
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you have more grass
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you have safer grass
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you have fewer sugar spikes
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you have stronger, deeper roots
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you have more resilience in dry spells
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you have an extended grazing season going into winter
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you’re not panicking about hay costs
It’s a shift from firefighting to forward planning — and it pays off year upon year.
References
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Longland, A.C. & Byrd, B.M. (2006). Pasture nonstructural carbohydrates and equine laminitis. The Journal of Nutrition, 136(7 Suppl), 2099S–2102S. DOI: 10.1093/jn/136.7.2099S.
- Kagan, I.A. (2022). Water- and ethanol-soluble carbohydrates of temperate grass pastures: a review of factors affecting concentration and composition. Journal of Equine Veterinary Science, 110, 103866.
- Longland, A.C., Barfoot, C. & Harris, P.A. (2016). Effects of grazing muzzles on intakes of dry matter and water-soluble carbohydrates by ponies grazing spring, summer, and autumn swards, as well as autumn swards of different heights. Journal of Equine Veterinary Science, 40, 26–33.
- Gartland, B., Strunk, W., Schulte, B., DeGraves, F. & Koostra, J. (2024). Time budgets differ in horses during continuous and space-restricted rotational grazing. Veterinary and Animal Science, 25, 100371.
