If one has "pet" horses with an occational light riding , one will feed it out in a pasture and/ or feed it grass type hays. This type of horse will exhibit a hay round belly and therefore carry excess weight of the hay. The performance horses such as racing, hunter/ jumpers, etc. , you will want to feed alfalfa hay and grain. This will give the horse much more athletic build, energy, tight belly and less excess feed weight to cary. My wife and I just arrived in Bend, Ore. last night. We will be here until late Friday. Just a few miles away on the outskirts of Medford, Ore. there is sign asking everyone ... BE RESPONSIBLE -- CONTROL INVASIVE WEEDS ! This area of Easter Oregon has large commercial farms growing alfalfa, garlic, onions, carrots, tomatoes, cerial grains, etc. on small farms to the hundreds to thousands of acres. On the more hilly areas they raise cattle , sheep, goats, horses. Controling weeds is what supports the farm owners, farm workers , migrant farm workers, as well as all of the small town residents' livelyhoods. Not to mention the impacted lives of all of the farm machinery and transportation industry for the agricultural products. The feed stores and grocery stores sell these products that you and I shop at.