The Horse Chow 100 I use has 10% protien.
All my horses, with the exception of Rusty are very easy keepers too, and require less then the reccommended amout. I think you just have to play with it for awhile and watch the horses closely. I've been giving Harley the same amount as Rusty and Rocky all winter so far, and he's really a bigger horse, and probably still growing some. Just in the last few weeks did I think he was dropping abit. I wanted to up him too since I'm hoping to start using him more.
Rocky stays the same, when being use or not. I think the regular worming is more key to them being easy keepers or not, unless they have some other problem, like Rusty. But because Rusty has improved so much since I've had him, I really think this feed really fills all their needs. Of course he would have picked up on hay/grain too, the complete just takes alot of the guess work out of if they are getting everything.
Becky
And as their entire daily ration.... that's good... 12% protein grain is a good percentage when fed along with hay that is probably more like 8-10%... But with hay it's always guesswork on the nutrition in it, I have no idea the difference between the really green orchard grass hay and this local bland stuff.
Just for comparison, I am feeding Cyn three small 1-lb coffee cans of 12% morning and night.... Bay gets two (plus his joint supplement) pony gets 1.
Hey - since you just realized how old Rocky is... he might benefit from a joint combo supplement now.... even though you probably don't want to think about him that way ;~D