Pica and Nutritional Deficiencies in Horses
"Pica, or depraved appetite, refers to the eating of materials other than normal food. This behavior can range from licking to actually eating foreign substances, and can be classified according to the type of material involved. Some of the more common types are: osteophagia, the chewing of bones; coprophagia, the eating of feces; lignophagia, the chewing and eating of wood; and geophagia, the eating of soil or sand. These behaviors can lead to serious and even fatal digestive complications, and therefore should not be taken lightly..." Pica in Horses is an excellent article.
Nutritional Deficiencies are clearly defined in the Merck Vet Manual.
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