How do you tell what the NSC content is for your feed if it isn't on the label? 

whats the brand of feed? 

Purina Impact 14 textured 

Have you gone to Purina's web site? I looked but could not find the NCS, just the ingredients.. I would call the company and ask them.. 

According to the purina website it's 18%.  If you google the feed and look at Purina website , it's 18%

Starch plus sugar  (both are listed on the feed label)

is how NSC is calculated . 

Correct, I meant to say that as well. Thats how I got 18%. 11 plus 7

Ok! I see it now. Thanks for the help!

While NSC is good indicator of the general makeup of a feed, the important number is the total daily contribution of NSC that feed provides. This can be important if you have a horse that needs special consideration of the starch and sugars that are in the diet. Most super low starch feeds are around 10% NSC. They are also low in digestible energy, so you feed more. One pound of a 10% NSC feed contributes  45 grams of NSC to the diet. Four pounds of that feed therefor contributes 180 grams of NSC. One pound of a 17% NSC high fat feed, (a typical replacement for four pounds of commercial low NSC feed) contributes only 77 grams of total NSC to the diet, and is generally less disruptive to the digestion of the roughage portion of the diet. Hind gut disruption can increase if more than four pounds per day of the 10% NSC is fed and the corresponding starch contribution increases. In general, low NSC feeds are very safe to feed, but this shows how the percentage number does not tell the whole story. 

So, if limiting the NSC in your horses diet is a goal, multiply the total grams in one pound of feed (454 grams = 1 pound) x percentage of NSC to get how many grams are in one pound of that feed. Then multiply that by the number of pounds that you are feeding to get the total contribution of NSC that feed is adding to the diet each day. You may well find that a slightly higher NSC feed that is fed at a lower rate actually puts much less total NSC in your horses diet every day, and may provide more digestive effeciency at the same time.

Win

Thank you Winwillows! That made complete sense!