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Bit mouthpiece
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Bit mouthpiece : ウィキペディア英語版
Bit mouthpiece

The mouthpiece is the part of a horse's bit that goes into the mouth of a horse, resting on the bars of the mouth in the sensitive interdental space where there are no teeth. The mouthpiece is possibly the most important determinant in the severity and action of the bit. Therefore, it should be carefully considered when choosing a bit for a horse. Some mouthpieces are not allowed in dressage competition.
The other parts of the bit are the bit rings on a snaffle bit, and the shanks on a curb bit. These pieces do not go inside the mouth, but rather are the parts of a bit that are outside the mouth, where the bridle and reins attach.
==Design concepts==
Particular mouthpieces do not define the type of bit. Often, bits with mouthpieces, such as those which are single- or double-jointed, are incorrectly referred to as snaffles, which is a term that describes a direct action bit rather than a leverage bit, not the mouthpiece. Although some mouthpieces are marked as "severe" and others as "mild," this is all relative. A heavy-handed rider can make even the mildest bit uncomfortable, and a skilled, light rider can ride in a much harsher mouthpiece without damaging the mouth or causing any distress in the horse. Additionally, the type of bit has a great impact on the action of the mouthpiece. Snaffles are generally considered the mildest, curbs and gags the harshest. It is difficult, therefore, to compare a harsher-type bit with a mild mouthpiece (such as a pelham with a rubber mullen mouth), and a milder-type bit with a harsher mouthpiece (like a snaffle with a slow twist). In general, however, the mouthpiece can have a marked difference on the severity. Snaffles with twisted wires are never considered mild, while a pelham with a low port may. In short, there are many factors in the bitting equation which must be considered to get a true estimate of the action and severity of a bit.
Various types of metal or synthetic substances are used for bit mouthpieces, which may determine how much a horse salivates or otherwise tolerates a bit; a horse having a moist mouth is considered more relaxed and responsive. Commonly used metals include stainless steel and nickel alloys, which generally do not rust and have a neutral effect on salivation; sweet iron, aurigan and copper, which generally tend to encourage salivation, and aluminum, which is considered drying and is discouraged as a mouthpiece metal. Synthetic mouthpieces may be made with or without internal metal cable or bar reinforcement. Rubber bits are generally thicker than metal bits, but other types of plastics are also used, often the same size as some flavored.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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