OP not sure if you can even get your hands on the stuff, but if you can find someone who carries Thrive holy heck the difference this feed makes especially on the older ones or ones that need to be rehabbed is amazing.
This thread is getting horribly long, lol... I don't think I could sit and read everything! I actually was considering Strategy GX, after consulting a horse rescue. We go feed her twice a day, and she is on pasture 24/7. Always round bale out there too. She has access to water in a trough and a pond. Also may try the weight booster Purina sells (comes in nuggets).... Will try the Sunflower seed oil when the bottle is empty. Only half left.