Was there a post on here awhile ago talking about a feed that speeds up a horses metabolism (sp) . If i was'nt dreaming what was it called and is it werth trying for ponies who hold their weight no matter what you do?
you could try kelp. this works, by helping the system to use the food efficiently, so breaking it down easier and not storing it. google kelp for weight loss. tells you for humans but works for horses too.
There is NAF Slimline which someone on here recommended to me. Its meant to make up the short fall with vits & mins for those on restricted diets and also speed up the metabolism. My mare has been on it a week now so not too sure yet how effective it is.