Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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Dr. Getty
Hi Dianne,
Generally speaking, most senior feeds are lower in starch than feeds for younger horses, simply because they have a higher concentration of fiber. I do not know the exact percentage of sugars and starches in either of these feeds (they are not offered on their websites). However, if the amount of senior pellets that Pistol is getting is small, it is not of great concern. So, it's a matter of degree.
I will contact both feed companies to see if they will divulge the %NSC (non-structural carbohydrates) and if I'm successful, I'll certainly let you know.
All the best,
Dr. Getty 
Where are you from? Bayfield, Colorado