Salt plays a large role in helping a horse maintain fluids. A dehydrated horse loses weight and isn't thrifty. Providing a salt lick is not a guarantee the horse is getting enough salt, in fact it's not. The lick was designed to be set out in a field for cattle. A bovine has a raspy tongue whereas a horse's is smooth. Therefore a horse has to lick many more times which results in a sore tongue due in part from salt irritation. A bovine licks with the top side of it's tongue whereas the horse will lick with the underside as well. A trace mineral lick which is about 97% salt should be provided in a sheltered area but loose salt should also be provided. A mix of course pickling and iodized kitchen salt will provide the horse with the salt it needs. What is the diffence in how much was ingested? Two horses went thro a 2lb lick about every 2-2,1/2 weeks. The same two horses go thro a 2 lb box of loose salt within 10 days. About a year ago a research paper on this was published which came to the same conclusion me and probably thousands of other concluded a long time ago.