Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
Welcome to my forum.
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 Nicole,
Choke is not a clinical sign of Cushings so I cannot address that specifically. Choke is more common in aging horses, so your horse may be suffering from age-related problems.
However, you did mention that your horse is being fed a senior "grain" feed. If this is grain-based -- meaning it contains a cereal grain such as oats, barley, corn, etc., you should discontinue feeding it.
Your horse does have clinical signs of cushings and/or insulin resistance, so it is very important to eliminate starch and sugars from the diet. Feed instead, a low starch feed such as Triple Crown Low Starch. And, add additional magnesium and chromium to the diet. I highly recommend Quiessence.
Thank you for writing.
All the best,
Dr. Getty 
Where are you from? Bayfield, CO