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.
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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
Hello Jaclyn,
To feed this Dumor Feed according to directions, you would need to feed 1.5 lbs per 100 lbs of body weight, which is more than what most people would feed (that would amount to 15 lbs per day for a 1000 lb horse!) Plus, it has a very minimal amount of vitamins and minerals, so all in all, I think it would be best to add a comprehensive vitamin/mineral supplement that offers flaxseed meal (for more fat plus omega 3s) to this feed. You can continue to feed as much as you're currently offering (no more than 4 lbs per meal) or you can increase it if he needs more calories.
The supplement I recommend is Glanzen Complete (3 scoops per day for a full sized horse). This would be an excellent approach. Or you could go with High Point for Grass Diets, plus 3 scoops of Nutra Flax per day.
Grass hay, free choice, some alfalfa (about 20-30% of hay ration would be ideal), temperature controlled water to encourage enough drinking during the winter, a plain white salt block plus salt offered free choice, and you're set!
All the best,
Dr. Getty 
Author of Feed Your Horse Like A Horse
Thanks
Where are you from? Bayfield, CO