Does she have to be stalled?
The reason I ask is because I find horses who are on stall time, only get a certain amount of hay access. When Nelson was being left in a stall, that was 15+ hours a day. Come in at 4, don't get let out until 10ish the next morning.
Figure hay would be given when they come in, takes a couple of hours to eat it up, which leaves the rest of that 15+ hours with nothing to eat.
I had Nelson on Ultimate Finish 100, plus his round bale when he was out during the day *I thought he was being left out at night as well, but turns out the barn wasn't following my requests* which made me realize why he wasn't gaining weight.
Now that he is out 24/7 at the new barn, I can't see ribs what-so-ever.
I believe, it was the stall time that caused that.
Sounds like, during the day, sandie is getting plenty of roughage. Maybe there is something going on in her digestive tract that is causing the lack of weight gain - maybe a digestive suppliment?
Now that we are at the new place, Nelson is infront of a round bale 24/7 - I know this because I am not paying for a stall. Plus fed twice a day - eating this: ProAdvantage Hi-Fat Formula ProAdvantage Grass Formula
I am still thrilled with SmartPaks suppliments - the SmartDigest Ultra I have Nelson on, and the SmartGut Pellets.
How much are you spending a month on all those suppliments you are buying?