Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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Dr. Getty
Hello R. Campbell,
Purina Wellsolve L/S is an excellent choice for IR horses because it is low in %NSC (approximately 12%) and also high in magnesium, which helps regulate blood insulin levels. Magnesium also improves behavior and disposition in many horses because most horses do not get enough of this mineral, resulting in borderline deficiencies that create a negative change to their demeanor and ability to concentrate and respond positively to requests.
Nutrena Safe Choice (poor name) is not safe for IR horses. Yes, it is lower in %NSC than high starch, sweet feeds but its level is approximately 26% NSC, which is not acceptable. Also it contains corn, which is very poorly digested and can more readily end up in the hind gut where it can be fermented by the cecal bacteria, increasing the risk of laminitis.
So, you can continue to feed it only to your non-IR horses, but in moderation because of the corn content.
Regarding iron -- 500 ppm is the limit for the entire diet.
Thanks for writing.
All the best,
Dr. Getty 
She just slowly savors each bite *quite comical actually* I told her tonight to guard it from the other two LOL
We decided to keep her on this and the other two who are not IR on Nutrena Safe Choice.
I truly hope we have found the last piece of the puzzle for my mare to have a long healthier life.
What I read on one website it shows as haveing 889ppm I think was the letters after it of Iron. Is that high or low?
Where are you from? Bayfield, CO