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The curb chain applies pressure to the curb groove under a horse's chin when the curb rein of the bit is used. When the curb rein is pulled, the shank of the bit rotates back towards the chest of the horse and the cheek (upper shank) of the bit rotates forward (since it is a lever arm).f used with a loose curb chain, it allows the shanks to rotate more before the curb chain is tight enough to act as a fulcrum and exert pressure. This extra rotation can warn the horse before pressure is exerted on his mouth, so he may respond beforehand.
How to Use a Stud Chain on a Horse. A stud chain is a lead line that has a chain on the end of it that attaches to the horse. it works similarly to a curb strap except it is used by someone who is handling the horse from the ground. Stud chains apply pressure on the underside of the horse's chin to encourage the horse to behave himself. This piece of equipment is called a stud chain because they are most commonly used to keep stallions in line when around mares.