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.
Grass isn't necessarily the problem, the type of horses we've developed and the lack of exercise are. Those of us with easy keepers need to limit the amount of fresh grass our horses have access to. Introducing lush pasture to a horse not used to it can cause serious problems as well.any of us don't have the luxury of being able to let our horses graze grass year 'round. Hay is the next-best choice. Finding good horse hay can be tricky. It also helps to have hay tested, so that any shortfalls in vitamins and minerals can be compensated for with supplements.