How to Manage High-Sugar Grass Varieties When Producing Hay for Horses

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Introduction

Many grass species naturally contain high levels of non-structural carbohydrates (NSCs), especially water-soluble sugars. While these grasses often produce lush, leafy, great-smelling hay, they can pose risks for horses prone to laminitis, insulin resistance, EMS (Equine Metabolic Syndrome), or obesity.

If you grow or bale high-sugar grass varieties, proper management is essential to create safe, marketable hay for sensitive horses.
This guide explains how to manage high-sugar grass varieties and reduce NSC levels through smart timing, drying, and storage practices.

Which Grass Varieties Are Naturally High in Sugar?

Several common forage grasses accumulate high sugar levels, especially in cool weather or drought.

✔ High-sugar species include:

  • Orchard grass
  • Timothy
  • Perennial Rye grass (among the highest)
  • Fescue
  • Meadow Grass
  • Bluegrass

These are popular for hay production because they produce:

  • Soft texture
  • Great leafiness
  • Strong yields
  • Excellent palatability

…but they require careful management for horses with metabolic issues.

Why Sugar Levels Matter for Horses

High NSC hay can trigger:

  • Laminitis flare-ups
  • Inflammation
  • Insulin spikes
  • Weight gain
  • Behavioral excitement in some horses

Buyers with metabolic horses will ask for NSC percentages — and hay above 12% NSC can be dangerous for these animals.

When Grasses Contain the Most Sugar

Understanding sugar cycles helps you manage them.

1. Time of Day

  • Highest sugars: Late afternoon to evening
  • Lowest sugars: Early morning (just after sunrise)

2. Weather Conditions

Sugars are highest during:

  • Cool nights (below 40–50°F / 4–10°C)
  • Drought stress
  • Cloudless sunny days
  • After frost

3. Stage of Growth

Immature grasses are tender and soft — but carry more sugar.

How to Reduce Sugar Levels in High-Sugar Grasses

1. Cut Early in the Morning

This is the #1 best method to reduce NSCs.

Cut just after sunrise, when plants have used up sugars overnight for respiration.

2. Avoid Cutting After Cool Nights

If temperatures dropped below 40–50°F the night before, sugar levels spike.
Wait until warmer nights return.

3. Allow for a Longer Cure Time

Extended drying helps reduce sugar through:

  • Respiration
  • Sun exposure
  • Oxidation

Wide-swath mowing increases sugar dissipation faster.

4. Ted Lightly to Increase Respiration

Tedding fluffs the hay and promotes faster sugar reduction.

But: Don’t over-ted legumes or you’ll lose leaves.

5. Consider Late-Maturity Cutting

Mature grasses have:

  • Lower sugar
  • Higher fiber
  • Thicker stems

While not as “buttery-soft,” they’re safer for metabolic horses.

6. Avoid Rapid Oven-Like Drying

Hay that dries too fast retains sugars.
Proper curing helps reduce them naturally.

7. Test Your Forage

To market hay confidently, provide lab results.

Recommended labs:

  • Dairy One Forage Lab
  • Equi-Analytical (super popular for horse owners)
  • Cumberland Valley Analytical Services

Horse buyers trust hay with a printed analysis.

Storage Tips for High-Sugar Grass Hay

Proper storage helps stabilize sugar levels and prevents spoilage.

✔ Store indoors

Sugar-rich hay molds more easily if exposed to humidity.

✔ Ensure airflow

Avoid stacking bales tightly during the first 2–4 weeks.

✔ Avoid storing warm hay

High-sugar hay heats faster.

✔ Keep hay dry and clean

Sugar attracts moisture — and pests.

How to Market Low-NSC Hay to Horse Owners

Metabolic-horse owners are one of the most loyal and best-paying customer groups.

Highlight:

  • NSC percentage
  • Cutting time (early morning = low sugar)
  • Weather conditions when cut
  • Hay type and species
  • Storage method
  • Leaf softness and dust levels

Honesty and transparency build trust fast.

Final Thoughts

High-sugar grass varieties can produce beautiful, soft, desirable hay — but only when managed with care. By cutting at the right time, promoting sugar dissipation during curing, and forage testing before sale, you can create safer hay for metabolic horses and command premium prices.

This level of attention to detail is what sets PremiumHaySupply.com producers apart from the competition.