On average, the untreated HIV infected patient will progress to AIDS in about 5-10 years. Since 1996, the introduction of powerful anti-retroviral therapies has dramatically changed the natural progression of HIV infection to the development of AIDS.
You CAN feed your horse just hay, but you have to up the portions and it also depends upon the type of hay you are feeding. Alfalfa mix is normally the best but there again, you're goinng to have to feed more hay to make up for the not feeding grain when you are riding.
Whether you feed grass or legume hay will depend primarily on what is available in your area and your horseâs particular nutritional needs. Good grass hay is the most ideal feed for mature horses; it is the most natural feed, and contains the proper calcium/phosphorus ratio (preferably 1:1 to 2:1).