The recommended amount to feed a horse is 2kg to 2.5kg
Hope this helps
*supplements if needed* but since one of my horses is old she needs them, especially since it’s cold where I live and it’s never cold here (Texas)
I guess it depends on what feed you are giving but my senior horse gets a scoop of senior pellet, and just regular pellet we buy from the feed store(scoop of that). And depending on where you live and your horse you’d give supplements.