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A breastplate (used interchangeably with breastgirth and breastcollar) is a piece of riding equipment used on horses. Its purpose is to keep the saddle from sliding back, and is most helpful on horses with large shoulders and a flat ribcage. It is also a safety feature, especially on cross-country, should a rider's girth or billets break, as she will have enough time to stop the horse and dismount before the saddle slipped off the animal's back or underneath its belly.

The breastplate is used on both English and Western saddles. When used in English riding, the hunting breastplate is made of thinner straps of leather, as is the western style used for horse shows. Working western horses in disciplines that involve work with cattle use a thicker, sturdier style.

A pony wearing a hunting breastplate. Note where it attaches to the D-rings of the saddle.

Being the classic breastplate for English riding, the hunting breastplate is the most common type. It consists of a yoke (with a neck and wither strap), a breast strap at the bottom of the yoke which runs through the horse's front legs and attaches to the girth, and two straps at the top of the yoke which attach to the D-rings of a saddle. There are usually buckles for adjusting the size of the yoke as well as the length of the straps which attach to the saddle and girth. The hunting breastplate not only helps to prevent the saddle from slipping, but also may be used to attach standing and running martingales, which are clipped or buckled onto a ring at the chest.

The hunting breastplate is most commonly made of leather, and some have elastic inserts on the yoke to help prevent it from restricting the horse's shoulders. Those used in endurance riding are commonly made of lightweight nylon or another synthetic material.

The hunting breastplate is worn by endurance horses, show hunters, fox hunters, equitation horses, eventers (it can be seen used in all three phases), and show jumpers. It is also occasionally see in flat racing, as well as steeplechase.

Because the hunting breastplate is attached to the D-rings of the saddle (which are known to be pulled out under great pressure), it is not as reliable as equipment attached to the saddle by means of the billets. Therefore, the breastcollar is sometimes preferred on cross-country.

The hunting breastplate also tends to have a restrictive effect on the shoulder, even when correctly fitted.

Additionally, a hunting breastplate may cause the tree points of a poorly-fitting saddle to dig into the sides of the horse's withers, creating rubs and great discomfort. In this case, it is best to get the saddle properly fitted before using a hunting breastplate.

A western style breastplate, usually referred to as a breast collar

The variation of a breastplate used for western riding is referred to as a breast collar. The term "breastplate" is occasionally used, though western riders generally use "breast collar" to refer to both designs. A working western breast collar may be of either a breastplate or breastcollar design. attach to the dee rings that hold the latigo of the cinch, while one suitable for a horse show may attach to decorative dees located above the cinch rings, nearer the swells of the saddle. In either case, an additional strap usually runs between the front legs and attaches to the cinch. Some, though not all breastcollars for western riding also have a wither strap.

The breastplate should not be fitted in any way that will restrict the horse's movement. Special attention should be paid to the shoulders, chest, and the area between the horse's front legs. In general, a fist should fit between breastplate and the horse's chest, and there should be a hand's width between the wither strap and the withers. The breast strap should be have some slack, and care should be taken that its buckle doesn't rub the sensitive skin in the area. It should also be adjusted so that the chest straps lie above the point of the shoulder so that the horse's motion is not restricted.

This racehorse wears a breastcollar.

The breastcollar consists of a chest strap, which buckles to one billet of the saddle, runs around the horse's chest, and attaches to the first billet on the other side. It also has a wither strap, which is used to adjust the height of the breastcollar, and prevents it from slipping down too far. The breastcollar is often made of leather, strong elastic, or webbing.

The breastcollar is more secure than the hunting breastplate, because it attaches to either the front billet of the saddle, or to the front branch of a split-end girth (which is even more secure). It is therefore most desirable in eventing, especially on the cross-country phase, polo, and other jumping disciplines. It is not used in dressage, hunt seat, or equitation.

• Tends to restrict the shoulders more so than other breastplates.

The breastcollar should be fitted so the chest strap is horizontal from chest to girth. The wither strap should be adjusted so that it is not so low that it interferes with the horse's shoulders, or so high that it presses against the animal's windpipe. As a general rule, a fist should fit between the wither strap of the breastcollar and the withers, and the chest strap and the chest of the horse.

A breastgirth.

The breastgirth is made of strong elastic, and runs from either the D-rings of the saddle, or is attached to a loop that runs around the saddle's stirrup bars. Although similar to the breastcollar, there is no wither strap. Breastcollars are usually seen in show jumping and eventing (usually on the cross-country phase). They are desirable because they tend to be less-restrictive to the shoulders, so the horse is better able to pick up his front legs and fold over a jump.

If the breastgirth is not adjusted correctly, it will restrict the horse's breathing because it will press on the windpipe. Additionally, it is not as secure as the breastcollar when it is attached to the D-rings.

First and foremost, the breastgirth should be adjusted so it does not restrict the horse's breathing. It should cross at the base of the neck, and may be adjusted snugly.