RE: mineral blocks
I looked at the list on a deer block and compared it to the cow/horse block and they looked the same so I think they are interchangable. I do know that you cant put them around goats because they contain copper and that somehow harms goats, or so I have been told by a guy at the ag store when buying my block he wanted to make sure their were no goats in the area I would be deer hunting. you should be able to find a block with higher minerals if you check a ag store in your area.