Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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Dr. Getty
Hello Becky,
I have not. But my concern is that barley (a cereal grain) and its sprouts, are likely high in non-structural carbohydrates (NSC). Therefore, if this is the case, it would not be appropriate for an insulin resistant horse (one that is overweight, has had laminitis, or has Cushing's). For those horses, a %NSC should be less than 12%.
For otherwise healthy horses, I would expect that it could be fed in moderation, as part of an overall diet, but not the entire source of forage.
If you have more information about the analysis of this product, please forward it to me.
All the best,
Dr. Getty 
Author of Feed Your Horse Like A Horse
Where are you from? Bayfield, CO