We tried several different feeds before finally finding on that actually worked for our bunch. We had to get some weight on the whole herd due to an illness they had all contracted. They recovered just fine, but had lost a LOT of weight.
We started them on Nutrena Life Design Compete (you can get it at Tractor Supply). They started gaining weight on it in spite of the winter weather. We sped up the weight gain by adding Purina Amplify (before we found out that Nutrena has an equivalent). By the time spring arrived, our horses were all fat and sassy again. Even the vet was impressed.
Now, our bunch is not in hard work, so if I think if we kept them on the Nutrena Compete, they would turn into real butterballs. So, we switched them over to Nutrena Prime, which is just a little lower in protein and fat than the Compete. If it looks like they are going to lose weight on the Prime, we'll switch back over to the Compete.
Right now, we only have two horses that are for sure broke to ride, and they are only ridden lightly. The other three are being started in the round pen, which isn't particularly hard work. We shall see how well they hold their weight, I guess.
Plain Old Dee, horses Dancer and Rain I believe in dragons, unicorns, good men and other mythical creatures!