Visit the  Salt Institute  for more information about salt.

Salt on the Farm

Like humans, animals need salt in their diets. Salt is actually the only mineral animals crave, so they instinctively look for it to consume. Supplementing livestock feed with salt is essential for optimal weight gain, milk production, and overall health.
Because an animal will seek as much salt as it needs, it is an ideal carrying agent for other essential minerals. In animals, these are called trace minerals, and they are important for disease prevention and overall animal health.