Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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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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All the best,
Dr. Getty
Hello Roxanne,
I'm with you -- an all forage diet for the horse that does not have additional energy needs (for work or performance) is ideal. However, grass can only go so far to fulfill all of your horses' vitamins and mineral needs. This is why I like adding a good multiple vitamin/mineral supplement that fills in all the gaps. Also, one that is flaxseed meal based, will offer omega 3 fatty acids. And, the supplement should contain essential amino acids lysine and methionine, otherwise adding alfalfa would be worth considering. So, the supplement I like for this situation is Glanzen or even Glanzen Commplete if the forage quality is not good or for a horse that is aging or has immune system problems.
I hope this is helpful. Thank you so much for writing!
Dr. Getty 
Where are you from? Bayfield, CO