OK her story- She is a 20-yr-old thoroughbred, has had a hard life. She is only ridden about once a week and lunged every few days for a few minutes to keep her active. She is very skinny. She is probably under 1000 lbs and 15'1. I had her on pasture this summer and it got over grazed so I moved her. She is very very very!!! Herd bound. So I tried stalling her to help with her weight. She eats sooo slowly, supper would be being fed and she would still have breakfast! It's because she's too busy worrying where her friends are. She also got stocked up and stiff. SO I moved her to a small paddock where her friends were in sight and she would have unlimited hay but all she would do is grab a bite then walk the fence line and look at her buddies. She was in this paddock for about a month. So I gave up on it and just put her out with the herd of about 10 horses. She is much happier BUT she is close to the bottom of the order and all she does is stand by her buddies and get bullied off the bail. She eats when the fatties are full or laying down. The vet says she is just old and a hard keeper and her teeth are good and I regularly deworm.
So I'm stuck in a jam, either she's unhappy alone and barely eating or happy and being bullied out of food. Where I board at they put out one round every 2 or three days and won't put out two becasue the bullies will get way too fat. There is no place to put her with a buddy it's either alone or with the group.
I can go out once a day and feed extra, but I have no idea what to feed or if once a day is good enough? I don't mean she get fed just once a day I mean she'll eat as much as she can off the bail when allowed and then I can feed her on top of that.
People have suggested rice bran, podium, seniors feed, cubes, beet pulp...
Ps- she has a very sensitive stomach and has showed signs of colic on beet pulp once and the other day just out in the paddock.