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
Hi Deborah,
The development of calcium carbonate stones in horses is largely inherited. But, it can be prevented if there is a balance between calcium and magnesium. Calcium in the diet is important, but it is helpful to remove alfalfa, as you've done, to manage the calcium levels better.
Vitamin B6 is also very important in preventing kidney stones. So, I would recommend adding Quiessence to the diet to provide additional magnesium, and B Plex, to add the extra B6.
With the complete rations that you're feeding, he'll get additional essential amino acids, so his protein quality will be fine without the alfalfa hay.
And, finally, watch his water consumption -- he needs to be drinking at least 8 gallons each day.
Hope this is helpful.
All the best,
Dr. Getty 
Where are you from? Bayfield, CO