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Big kudos on taking them in and giving them a better life!
I would betcha their problem (other than their history of course) is two things:
1) Horses are grazing animals and NEED hay or good grass available pretty much 24/7. It sounds like yours are only getting roughage during the "day" when they are out on grass, which even if you put them out at dawn and take them in at sunset means 12 hours without roughage, which for a skeeny horse is just too long.
2) Being thin, malnourished and somewhat older, they need a lot more total protein in their diet - your grass this time of year is unlikely to have high protein content so you will need a hard feed that is higher in protein than just 11%. (11% is fine for fat happy pleasure horses of course).
If you can't get hay at present then beet pulp is probably your best Plan B if you can manage at all to get them to eat it. Yes, it IS digestible by horses and it DOES put genuine weight on them, not just filling up their tummies. They may need time to adjust to it though. Alfalfa cubes (from the feed store) would be another option in theory, but I'd worry that skinny older horses with less than perfect teeth and avid appetites would choke, which is unfortunately not uncommon even if you soak the cubes first. When you can get hay, obviously that's the best. Whatever roughage you use, keep it in front of them in plenty, 24 hours a day.
Purina Equine Senior is a really good feed for horses like your two - it is easily chewed, easily digested, higher in protein if memory serves me, and has some fiber in it already. If you can only obtain/afford generic sweet feed, at least use the highest protein content you can get. Or a higher-protein "fat-and-fiber" type pelleted feed.
Like everyone else says, have their teeth done -- preferably not by your "real country" vet <g> but by someone who uses a speculum and cares about salvaging older horses. They will also probably need more frequent worming, and have you wormed for tapeworms too?
Oh, and start blanketing them on cold nights and rainy/windy days... it is amazing how much more metabolic energy tthey can put into weight gain if they're not having to turn up the thermostat against the weather!!
Best of luck,
Pat, still almost totally ignorant about chickens but a long time horse person