30/03/2026
Autumn Grass Flush – Is Your Horse Affected? 🌱🐴
Hello there,
As we head into another autumn flush of grass, have you noticed any behaviour changes or health issues in your horse?
Ever wondered why, despite New Zealand horse owners widely using the term “grass affected” to describe pasture-related issues, the feed industry continues to offer an ever-growing range of flashy feeds and supplements?
They promise to fix everything… yet if we’re honest, they often don’t.
Why?
Because if your horse grazes pasture and/or eats hay, this will always make up the majority of their diet.
That means nutrient imbalances—whether energy, sugars, starch, minerals, dry matter, or vitamins—are most likely coming from your forage. Even the best feeds may in some cases may add to the problem if not used correctly to balance what is imbalanced in the pasture.
Real-Life Examples
Horse A
500kg, light work
Grazed 24/7
1kg hay
500g hard feed (chaff, minerals, manufactured feed)
➡️ 87% of diet = pasture
Horse B
500kg, light work
Grazed 10 hours/day
4kg hay
2kg hard feed
➡️ 30% of diet = pasture
Horse C
500kg, medium work
Grazed 11 hours/day
2kg hay
500g hard feed
➡️ 79% of diet = pasture
Why This Matters;
Horses are hindgut fermenters—meaning the microbes in their hindgut break down fibre to provide energy and support overall health.
So when pasture is the issue everything can be affected.
That could be due to:
Low dry matter (too much water, not enough fibre)
High sugars or starch overwhelming the hindgut
Mineral deficiencies or imbalances
The potential issues from pasture are endless.
The Take-Home Message
It doesn’t make sense to spend large amounts on feeds and supplements without first understanding what your horse is eating the most of—your grass and hay.
✔️ Get your pasture or hay analysed
✔️ Then work with a nutritionist to balance the diet for your individual horse
That’s where real change happens.
Happy days!