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.
Currently, I am discontinuing new questions. This may change in the future, but in the meantime, please know that It has been a true pleasure serving you.
Take a look at my Nutrition Library and Tips of the Month for a variety of answers on selected topics. Be sure to sign up for my monthly e-newsletter, Forage for Thought.
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All the best,
Dr. Getty
Hi Sam,
You're doing fine -- I would consider, however, adding two things to her diet:
First, fat from flaxseed (linseed) meal. Make sure it is not defatted linseed meal. Give her 150 to 170 grams per day, divided between meals.
Second, yes, a supplement that contains branched chain amino acids (building blocks of protein) would benefit her muscle development. I like the product SuPer Muscle Builder because it also is high in a substance known as Gamma Oryzanol, which further boosts muscle development. Perhaps you can find something like that in your area, since shipping it to England would be pricey.
So, these two things will be helpful. If after a couple of months, she is still not gaining weight, let me know and you may find a phone consultation helpful. I now offer them internationally.
All the best,
Dr. Getty 
Where are you from? Bayfield, CO