Жылқының ауыздық тетігі: түрлері мен қолданылуы

A snaffle bit is the most common type of bit used while riding horses. It consists of a bit mouthpiece with a ring on each side and acts with direct pressure. A bridle utilizing only a snaffle bit is often called a "snaffle bridle", particularly in the English riding disciplines. A bridle that carries two bits, a curb bit and a snaffle, or "bradoon", is called a double bridle. A snaffle is not necessarily a bit with a jointed bit mouthpiece, as is often thought. A bit is a snaffle because it creates direct pressure without leverage on the mouth. It is a bit without a shank. Therefore, a single or double jointed mouthpiece, though the most common designs for snaffle bits, does not make a bit a snaffle. Even a mullen mouth (a solid, slightly curved bar) or a bar bit is a snaffle.

The snaffle bit works on several parts of the horse's mouth; the mouthpiece of the bit acts on the tongue and bars, the lips of the horse also feel pressure from both the mouthpiece and the rings. The rings also serve to act on the side of the mouth, and, depending on design, the sides of the jawbone. A snaffle is sometimes mistakenly thought of as "any mild bit". While direct pressure without leverage is milder than pressure with leverage, nonetheless, certain types of snaffle bits can be extremely harsh when manufactured with wire, twisted metal or other "sharp" elements. A thin or rough surfaced snaffle, used harshly, can damage a horse's mouth. Curb chains or straps have no effect on a true snaffle because there is no leverage to act upon. English riders do not add any type of curb strap or curb chain to a snaffle bit. While some riders in western disciplines do add a curb strap to the rings, it is merely a "hobble" for the rings, has no leverage effect and is there only as a safety feature to prevent the rings from being pulled through the mouth of the horse, should the animal gape open its mouth in an attempt to avoid the bit, an outcome prevented in an English bridle by the presence of a cavesson noseband.

The snaffle differs from the pelham bit, the curb bit, and the kimberwicke in that it is a non leverage bit, and so does not amplify the pressure applied by the reins. With a snaffle, one ounce of pressure applied by the reins to a snaffle mouthpiece will apply one ounce of pressure on the mouth. With a curb, one ounce of pressure on the reins will apply more – sometimes far more – than one ounce of pressure on the horse's mouth. Mullen mouth: made of hard rubber or a half moon of metal, it places even pressure on the mouthpiece, lips, and bars. It is a very mild mouthpiece. Roller mouthpieces: tend to make horses relax their mouth and activate the tongue, encouraging salivation and acceptance of the bit. This may also focus tense or nervous horses to the bit. Egg butt/barrel head: mouthpiece does not rotate, and is so more fixed in the horse's mouth, which some horses prefer. Will not pinch the lips. D ring/ racing snaffle: ring in the shape of a "D" which does not allow the bit to rotate and so the bit is more fixed. The sides of the D provide a lateral guiding effect. Full cheek: has long, extended arms above and below the mouthpiece on either side of the lips of the horse, with a ring attached to it. The cheeks have a lateral guiding effect, and also prevent the bit from sliding through the mouth. The full cheek is often used with bit keepers to prevent the cheeks from getting caught on anything, and to keep the bit in the right position inside the mouth. Half cheek: has only an upper or, more commonly, lower cheek, as opposed to both seen in a full cheek snaffle. Often used in racing, as there is less chance of the cheek being caught on the starting gate, or in driving as there is less chance of getting caught on harness straps. Baucher (hanging cheek): has a ring on the side of the mouthpiece, with a smaller ring above to attach the cheekpiece of the bridle. Tends to concentrate pressure on the bars. It is very fixed in the mouth. Fulmer: a full cheek bit with a loose ring attached, so that it not only has the lateral guiding effect, but can also move freely as with a loose ring.

Edwards Complete Book of Bits and Bitting pp. 52–54
Kapitzke Bit and Reins p. 79
Edwards Complete Book of Bits and Bitting p. 55
Edwards Complete Book of Bits and Bitting p. 68
Edwards Complete Book of Bits and Bitting p. 57
Edwards Complete Book of Bits and Bitting p. 58
Kapitzke Bit and Reins p. 95