Soya meal for barefoot?

[zinzin]

All my horses are now on barefoot diets (speedibeet, magnesium, micronised linseed and either pro hoof or zinc & copper). They are all doing well on it apart from one rising 4 yo who is much skinnier than I would like. She has ad lib haylage but she isnt a huge eater, not fussy just nosey and easily distracted.
Can anyone advise whether adding soya meal would be suitable for putting weight on? How much linseed can I safely feed to add weight? Thanks in advance!

 

[zinzin]

Anyone????

 

[Oberon]

Easily calorie yield. Some horses do well on it, some don't. Worth a try.