Originally Posted by Spastic_Dove
Horses use the blocks when they are bored, the vets I have spoken to have all agreed that the horse won't KNOW that this block gives them salt or minerals or whatever. I would suggest adding it to their feed
Of course they don't know, but it's a drive that they have when they need something. It's like when people have vitamin or mineral deficiencies and they have weird cravings and eat weird things to satisfy their body.
Regardless, if a horse is getting a complete feed and they have a mineral block and they lick it they can take in too many minerals since the feed already supplies them to the horse. And that can upset the balance of things.