Looking Past the Obvious: Why Spring Grass Is More Dangerous Than It Looks

The lush green fields of spring look inviting, but beneath the surface, non-structural carbohydrates (NSCs) — sugars and starches — are surging. The real challenge with spring grass isn't how green or thick it looks. It's what's happening at a chemical level inside the plant.

What Are NSCs and Why Do They Matter?

NSCs are sugars and starches produced by grass through photosynthesis. As spring weather shifts, so do NSC levels. Warm days with plenty of sun cause NSCs to rise rapidly. Crucially, when temperatures drop overnight but daylight remains, those sugars aren't used up — they stay locked in the leaf tissue, ready to be consumed at the next grazing session.

Even sparse-looking spring pasture can carry NSC levels of 15–25%+ on high-risk days — well above the recommended threshold of under 10% for sensitive horses.

What Triggers NSC Spikes?

• Warm, sunny days drive rapid sugar accumulation through photosynthesis
• Cool nights slow the plant's metabolism, so sugars aren't used up overnight
• A cool but sunny spell can keep sugar levels dangerously high
• Sudden weather changes make it hard to predict which days are safe for turnout

Paying close attention to these shifts is key — and even fields that look bare can pose a significant risk.

What Happens Inside the Gut When NSCs Spike?

Research consistently links elevated dietary NSC intake to three key risks:

• Hindgut acidosis — rapid fermentation of excess sugars disrupts the microbial balance in the caecum and large intestine, dropping pH and damaging the gut lining
• Laminitis — triggered by inflammatory cascades originating in a compromised gut
• Gastric ulceration — stress on the digestive system from erratic feeding patterns and high-sugar forage increases acid exposure to the stomach's squamous mucosa

How a Gastro-Digestive Supplement Like EASIGastro Pro Can Help

The gut is the first line of defence. A well-formulated gastro-digestive supplement works on multiple levels to protect your horse through the spring transition:

• Buffering gastric acid — helps neutralise excess acid, protecting both the squamous and glandular regions of the stomach
• Supporting hindgut microbiome stability — prebiotics and live yeast cultures help maintain microbial diversity when fermentable carbohydrate load spikes
• Mucosal integrity — soothing compounds coat and protect the gut lining from acid damage
• Reducing systemic inflammation risk — a stable gut microbiome limits the translocation of endotoxins that can trigger laminitic episodes

Spring grass changes daily — your horse's gut support shouldn't. Consistency of supplementation matters more in spring than any other season, and even horses without a history of gut issues are at risk during the spring transition.

Key Takeaways

• NSC levels in spring grass fluctuate with temperature and light — not just how the field looks
• Cool sunny days are often the highest-risk days for turnout
• Hindgut acidosis, laminitis, and gastric ulceration are all linked to NSC overload
• Proactive gut support with EASIGastro Pro can help protect your horse through the season