Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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All the best,
Dr. Getty
Hello Ursula,
When grass is cut to make hay, it is dried for a few days prior to baling. So it has already "cured." It is safe to feed. However, my concern is whether or not the hay has the appropriate %NSC (non-structural carbohydrate) level for an insulin resistant horse. It is very important for you to have it analyzed.
I discuss this at length in my book, Feed Your Horse Like A Horse, so I hope you've had a chance to read it. But, please send a hay sample to a reputable lab such as Equi-Analytical Labs.
If you need any assistance interpreting your report, let me know.
All the best,
Dr. Getty 
Author of Feed Your Horse Like A Horse
how long do you have to wait to feed fresh baled
hay from the field to the horses? I'm running out
of my old hay and the farmer I got my hay from is
just cutting and baling hay this week. Some people
say to wait at least 3 weeks for the hay to cure.
Some people feed it right away. I have 2 Morgans both
on the fatter side. One of them is IR. They look
good right now. I do feed free choice hay in hay nets
and would mix it with the rest of the old hay. Still
I'm concerned about colic. Please give me advice.
Sincerely
Ursula
Where are you from? Bayfield, CO