Billy I have had back luck with protein blocks because the horses love them way too much.
I put them out and the horses sit there and eat on them continuously like a kid in a candy shop until they are gone. Last time I tried that, I put one out in the barn yard one morning and by afternoon it vanished, that fast. YIKES!
Instead, I put a 50 lb white salt block out, and containers of Purina 12 12 Free Choice Minerals. They take what they want/need and leave it.
Actually Purina changed the name of those minerals, but that's what I do. :saludando:
I also feed Purina Born to Win so I think I have all my bases covered. :bgrin