Not just the amount of food a heavy draft like Rosie consumes but the type. When I decided a draft horse was for me I did a bit of research but more which breed would be more tolerable to mistakes. Which breed is hardy. Which is more calm then the others etc.
I never thought about muscle or neurological disorders. Or how diet effects that. When some one sees an under weight draft they immediately think starvation case. While sometimes this is the case I found out that most cases are from EPSM.