You can try different suppliments but you can also try milk plus, calf mana (I don't know how to spell it), then there is another thing made by bluebonnet I think. When you go to the feed store ask them what would be best. They know nutrition better than your average person. Also give good hay. Even just a couple of flakes a day would help. A bale could last a week depending on the bale. Make sure your horses are wormed regularly also. Them having worms can keep them from gaining weight.

thxs ill check into that i usual give her hay every day and i put oil on her food

What kind of oil? What percent feed are you feeding her now?

vegetable oil her food is 16% and we just got some oats also i think my mom ordered some  dumar pleasure for hard keepers

16% is kind of high for a non active horse. I know there are many reasons why people put oil in feed but what is your reason? I feed my horses 12% stable blend which is just a dry mix. And mix it with a feed called one and only thats only 9%. The one and only is supposed to be a very safe feed. Horses can't colic from it suposedly. And when feeding them it you don't need hay either. I still give hay though. They say you can put the feed out in a pasture and let the horses eat whenever they want and as much as they want like cows.

Corn also helps put weight on horses and gives them nice coats but you can't feed it to them straight.

i think its mare and foal ill just feed her a litle bit every time i go down and the vet said to put oil on her feed to gain weight. since she is a cribber before we got her shes been loseing weight so we put a cribbing muzzle on her becuz she cribbs right through the collar. the guy the owned her had a very small place and had her sister her mother her brother and a yearling that all cribbed.also i have a question do you have to soak the oats

Soak the oats with what? For adding suppliments?