A lack of salt in your animal feed is easily remedied. By using animal feed salt as nutritional supplement, you can be certain that the animals are getting the necessary minerals. Salt deficiency can occur through feed that has too little sodium, unilateral fertilizer application of crops or low-quality grass or hay. A lack of salt can have dire results for the health of your animals. Muscle cramps, a harsh coat and reduced appetite are just a few of the symptoms that occur.