A horse becomes cast when they lie down next to a wall with their legs facing away from that wall, then they roll over onto their backs and continue that roll until their legs now face that wall (they fully roll over).
Instead of having room to position their legs to get up or even roll back, the wall now becomes a blockade preventing their legs from being placed underneath. The horse is unable to rise or roll upright. They are stuck. Horsemen call this casting.
As you see in the gallery, casting rails attached to the walls gives the horse the ability to secure their hooves to the wall and push their body away. They can now get up. They are an inexpensive addition to any stall.
See more here: The Cast Horse
⬇︎ Click or tap on any image to fully open it. Swipe or click the arrow to move through the gallery. ⬇︎