Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
Welcome to my forum.
Here you will find more than 6 years of questions and my answers. It is searchable and offers a great deal of information.
Currently, I am discontinuing new questions. This may change in the future, but in the meantime, please know that It has been a true pleasure serving you.
Take a look at my Nutrition Library and Tips of the Month for a variety of answers on selected topics. Be sure to sign up for my monthly e-newsletter, Forage for Thought.
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All the best,
Dr. Getty
Hi Taryn,
That would depend on how much hay and/or pasture your horse is already receiving. Generally speaking, you should feed at least 2% of the body weight in forage. So, for a 1000 lb horse, that is 20 lbs.
But, that's a general statement. Things like overall weight, age, and hay quality would come into play here, as well.
Thank you for writing!
Dr. Getty 
Where are you from? Colorado