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Typical horses (not pregnant, not nursing a foal, not a breeding stallion, not with relevant health problems, not in STRENUOUS training) do really well on good pasture
without any supplemental hay or grain at all (a salt block is usually desirable tho).
Not everywhere has good pasture, however; and even if you start out with it, it may not stay that way.
I would say that the majority of horsekeeping properties I've seen, do not have particularly good pasture. Even in geographic regions where good pasture is fairly easy to have. Because people overload the pasture with horses, and let them stomp it all to heck during mud season and overgraze it badly, and the soil gets compacted and leached and depleted and the weeds take over from the grass and the dirt takes over from the weeds.
The amount of land it takes to support a horse varies WILDLY across the country and even between properties in a single area. So don't get too attached to the '2 acres' number -- for a horse living out 24/7 that will only be enough in the very best pasture-growing regions of the country, and still may not be quite enough unless the soil is exceptionally well drained. (Compaction from hooves stomping damp or muddy ground is just as much a threat to pasture health as overgrazing is).
Also, I don't know of anywhere (there may *be* somewhere, I've just never heard of it
) where pastures grow well enough all year round to keep horses on full pasture 12 months a year.
So realistically, even IF you start with good pasture and keep it in good ongoing condition, there will be some months of each year when you need to feed hay instead. Thus the need for a hay budget even if your horses live out 24/7 on good pasture
year-round
Also, I worked at a horse farm once and I never recalled seeing them feed their horses grain. Is grain completely necessary or is it just something you can do for your horse?
Actually, it is often something you "can" do TO your horse. Not only is it frequently/usually unnecessary, it is frequently somewhat a BAD idea. I do firmly believe there are some situations when a concentrate of some sort is desirable or really necessary; and grain (preferably in the form of 'straight' grains, not sweet feed, IMO) is one of your options for that.
But IMHO an awful lot of horses getting grain would be the same or better off without it.
Have fun,
Pat