Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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All the best,
Dr. Getty
Hello Ana,
You have done a wonderful thing by adopting this mare and she is very, very lucky to have you!!!
I have a few of suggestions for you to help her stay healthy and to help her keep her weight. First, let her have as much hay as she wants. In other words, she should have hay available to her 24/7 so she can nibble as she pleases. This will help her get the calories she needs, plus is will keep her happy (stress can increase the likelihood of another attack of laminitis).
Second, instead of Senior Feed, go with something that is not grain-based. Senior feed contains oats and grain is not a good idea for a horse that has foundered. So, instead, just increase the amount of alfalfa/bermuda pellets to 2 lbs each meal.
And, lastly, you'll want to give her a good multiple vitamin/mineral supplement to fill in the gaps. Even with the complete ration (which you'll be discontinuing), you were only giving one cup per meal, which is not enough to get the benefit of the added vitamins and minerals.
Since she has had one experience with laminitis, I would suggest that you give her a product that has omega 3 fatty acids and is high in antioxidants, to keep the inflammation in her feet from returning. PreOx is one that I highly recommend -- at a maintenance dosage of one ounce per day.
I hope this is helpful. Keep up the fine work!
All the best,
Dr. Getty 
Where are you from? Bayfield, CO