Interesting article. Here is a snip from the article…
“Horses are prey animals, and like most animals whose chief form of defense is flight, they are up on their feet almost immediately after birth. At first they stagger around in the straw in their stalls, pitching their outsized legs out like tent poles for support, but within an hour or two they are on their feet and nursing.
For foals born with a disorder called maladjusted foal syndrome (MFS), that transition isn’t so smooth. These foals are detached and disoriented. They don’t seem to recognize their mothers, failing to make normal sounds or try to nurse. One foal at the UC Davis center couldn’t find his way out of a corner and tried to climb into the feeder bin. Horse breeders call them “dummy” foals.”