Feed for horses can be divided into three categories: pasture, hay and concentrates.
The most natural food for horses is good quality pasture. Most mature pleasure horses doing light work will do well on pasture alone if they have sufficient grazing but Do not feed your horse grass clippings as they can cause founder.
Hay- This must be of good quality and free from dust and mould. Feeding moldy hay can cause colic and dusty hay can cause respiratory problems
Concentrates - You can buy bags of feed specially formulated for every stage of a horse's life from creep feed for foals to feed for senior equines. For horses in light work a pasture mix is more than adequate.