Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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Dr. Getty
Hi Jamie,
I'm sorry to hear about your horse's kidney problem. This takes very careful management and continual testing to make sure that it is not worsening.
His diet needs to be low in potassium. And, because his kidneys are not working well, he is not producing vitamin D and he will likely become anemic (requiring iron, either supplemental iron or injections).
The feeds you mentioned are too high in potassium. The protein content is necessary, but should not be too high. You'll want to find one that has less than 1.5% potassium and around 10% protein.
Hay may need to be soaked, as well, to reduce the mineral content. Pasture is much safer, but this time of year, it is hard to come by.
I would discuss anemia with your vet, have bloodwork done every few weeks, to see if you can get him stabilized.
Please let me know if I can assist you further.
Dr. Getty 
Where are you from? Bayfield, CO