As jaydee says, it depends what you're feeding for & how much. I don't believe big & rich irregular feeds are a good move, but a few handfuls as a treat, &/or some chaff, beet pulp, etc added is also fine. It is also no worries to feed immediately after exercise - so long as the horse isn't puffing straight from a gallop or some such.
Horses are built for little & often browsing of high fibre, low starch diets. One factor of that is, they dont digest well feeds - particularly starchy - that are fed infrequently. They then have a higher likelihood of causing digestive upsets. That's the reason it's also important to introduce/change feeds gradually too. So for arguments sake, want to start feeding 4lb oats & 4lb beet pulp; I'd start with 2 cups, pref over couple feeds, and raise it a cup every few days till you get to your goal.
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