Salts blocks are provided by various vendors including the Tractor Supply Company. Their online store provides many outdoor goods such as lawn care, power tools, and fencing materials.
According to the Tractor Supply Company, medicated salt blocks are used to replenish various nutrients that are lost in animals. A salt block typically contains a combination of vitamins, minerals and proteins that may be missing from an animals available food supply.
The Tractor Supply Company cautions that over-consumption may occur if the block is given to animals that are underfed or malnourished. Consumption of this product should be limited to five pounds or less a day.