Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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Dr. Getty
Hi Lynn,
The 6 ounces I referred to is by weight not volume. So, 1/2 cup (volume) weighs 2 ounces (weight). I recommend 1/2 cup per 400 lbs of body weight. That translates into 1 1/2 cups for a 1200 lb horse (which weighs 6 ounces). Our system is confusing since we use the term ounces to describe fluid ounces and ounces by weight.
So, you're feeding 3/4 cup, twice daily, which is exactly 1 1/2 cups per day, which weighs 6 ounces. Exactly right! 
Omega Horseshine is a flaxseed meal product that also contains oats -- so please keep that in mind if your horse needs to avoid too much starch. This is why I recommend Nutra Flax since it is pure flaxseed meal (with a very slight amount of calcium added to correct for the naturally inverted calcium to phosphorus ratio found in flax).
Thank you for giving me the opportunity to clarify this "ounce" situation.
All the best,
Dr. Getty
Author of Feed Your Horse Like A Horse
Thanks,
Lynn
Where are you from? Bayfield, CO