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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.
You can train your horses to use either. For example, the horse trailer ramps seem to be more popular on the East coast of the USA. In Texas the step up is more frequently spotted. Europeans mainly use ramps. In some special cases it is necessary to use a ramp because of the special needs of your horse. First of all, measure the distance starting from the ground up to the trailer floor. 2  Measure the height and width of your trailer door. 3  As a result you will have the ramp width. 4  It should be narrower than the width of the trailer door in the width of a half an inch. 5  Get the proper ramp slope.