Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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All the best,
Dr. Getty
Becky:
Wondered if you can get a couple of bales of alfalfa to try the mare on that? I tried alfalfa pellets with mine, and they acted like it was poison or something, but they LOVE alfalfa hay. Guess the pellets didn't LOOK like forage. 
Nancy
Where are you from? Tennessee
How did you locate this forum? google search
Hi Becky,
As Nancy suggested, alfalfa hay would be worthwhile adding to the diet to help with weight gain. I frankly, have never seen a horse that didn't like alfalfa hay (pellets? yes -- but not the hay).
Add a weight gain product, as well, to the diet. You can mix it with a small amount oats, just to provide a "carrier" for the supplements. I recommend Hard Keeper.
Keep me posted!
Dr. Getty 
Where are you from? Bayfield, CO