We live in Indiana and all of the horses get the same thing year round only in varying quantities (like more in winter, less in summer). They usually get fed 2x daily or just grained once and given hay the other time, just depends on how they look.
-sweet feed (which I know many do not feed and disagree with, but I've never had a problem using it or had my horses go "crazy", but then again they're out 24/7, 365 days....)
-24/7 access to grass or hay which is a grass hay and when we can get it alfalfa mix.
-during the winter empower and my old mare gets msm for her joints
-salt/mineral licks are out in the field
While some owners out there have their horses on all kinds of supplements I found it cheaper, easier and healthier to just go with the bare minimum for my two. I never saw the need for them to get a coat shine supplement or anything they didn't need. If they need it I'll give it to them but until then they're stuck with the regular. :)
Ps: Can I like what Cherie said twice.... maybe even four times? ;)