Foal Eats Manure

AThis charming behavior is called coprophagia, from the Latin for "feces eating." In young foals of any equid species, it appears to be just as normal as grooming, nursing, or romping. There is an obvious peak in frequency at about two weeks to one month of age. It is usually the dam’s feces, and you’re right–they can ingest substantial quantities, and freshly voided manure seems to stimulate their interest. In wondering why this behavior has evolved (meaning the benefits have outweighed the risks), veterinarians and animal scientists typically discuss a couple of ideas. One is that eating feces of an adult herdmate might effectively populate the gut of the young with the "good" microorganisms that aid in digestion. Another idea is that parasite eggs are ingested as well, possibly stimulating the young immune system to build a defense against parasites. There’s probably not good proof, but I find thinking about potential benefits can dispel disgust. However, it is thought that coprophagy is a good reason to keep mares on a deworming schedule pre-partum as prescribed by a veterinarian, since the foal will be ingesting parasites.