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Foal
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A foal is an equine, particularly a horse, that is one year old or younger. More specific terms are colt for a male foal and filly for a female foal. When the foal is nursing its dam (mother), it may also be called a suckling. After the young horse has been weaned from its dam, it may be called a weanling. After it is one year old, it is no longer a foal, and is called a yearling. There are no special age-related terms for young horses older than yearlings.
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A foal is an equine, particularly a horse, that is one year old or younger. More specific terms are colt for a male foal and filly for a female foal. When the foal is nursing its dam (mother), it may also be called a suckling. After the young horse has been weaned from its dam, it may be called a weanling. After it is one year old, it is no longer a foal, and is called a yearling. There are no special age-related terms for young horses older than yearlings. When young horses reach breeding maturity, the terms change: a filly over the age of three (four in horse racing) is called a mare and a colt over the age of three is called a stallion. A castrated male horse is called a gelding, regardless of age. (There is no specific term for a spayed female horse, they are simply "spayed mares".)
Early development
Foals are born after a gestation period of approximately 11 months. Birth takes place quickly, consistent with the status of a horse as a prey animal, and more often at night than during the day. Foals are born with an ability to quickly escape from predators; normally a foal will stand up and nurse within the first hour after it is born, can trot and canter within hours, and most can gallop by the next day. A newborn foal's legs are almost as long (90%) as those of an adult horse.
Healthy foals grow quickly and can put on up to three pounds or over a kilo a day. A sound diet improves growth and leads to a healthier adult animal, although genetics also plays a part. In the first weeks of life the foal gets everything it needs from the mare's milk. Like a human infant, it receives nourishment and antibodies from the colostrum in milk that is produced within the first few hours or days following parturition. The mare needs additional water to help her produce milk for the foal and may benefit from supplementary nutrition.
A foal may start to eat solids from ten days of age, after eight to ten weeks it will need more nutrition than the mare's milk can supply; supplementary feeding is required by then. It is important when adding solid food to the foal's diet to not overfeed the foal or feed an improperly balanced diet. This can trigger one of several possible growth disorders that can cause lifelong soundness problems. On the other hand, insufficient nutrition to mare or foal can cause stunted growth and other health problems for the foal as it gets older.
Weaning and maturity
It is typical for foals under human management to be weaned between four and six months of age, though under natural conditions, they may nurse for longer, occasionally until the following year when the mare foals again. A foal that has been weaned but is less than one year old is called a weanling.
Mare's milk is not a significant source of nutrients for the foal after about four months, though it does no harm to a healthy mare for a foal to nurse a month or two longer and may be of some psychological benefit to the foal. A mare that is both nursing and pregnant will have increased nutritional demands made upon her in the last months of pregnancy, and therefore most domesticated foals are weaned some time in the autumn in the Northern Hemisphere.
Weanlings are not capable of reproduction. Puberty occurs in most horses during their yearling year. Therefore, some young horses are capable of reproduction prior to full physical maturity, though it is not common. Two year olds sometimes are deliberately bred, though doing so, particularly with fillies, may put undesirable stress on their still-growing bodies. As a general rule, breeding young horses prior to the age of three is considered undesirable.
Early training
In spite of rapid growth, a foal is too young to be ridden or driven. However, foals usually receive very basic horse training in the form of being taught to accept being led by humans, called halter-breaking. They may also learn to accept horse grooming, hoof trimming by a farrier, having hair trimmed with electric clippers, and to become familiar with things it will have to do throughout life, such as loading into a horse trailer or wearing a horse blanket. One of the most important aspects of working with foals is to remember that horses in general have excellent memories, so a foal must not be taught anything as a young horse that would be undesirable for it to do as a full-grown animal.
There is tremendous debate over the proper age to begin training a foal. Some advocate beginning to accustom a foal to human handling from the moment of birth, using a process termed imprinting or "imprint training". Others feel that imprint training of a foal interferes with the mare and foal bond and prefer to wait until the foal is a few days old, but do begin training within the first week to month of life. Yet other horse breeding operations wait until weaning, theorizing that a foal is more willing to bond to a human as a companion at the time it is separated from its mother. Regardless of theory, most modern horse breeding operations consider it wise to give a foal basic training while it is still young, and consider it far safer than trying to tame a half-wild adult-sized horse.
Horses are not fully mature until the age of four or five, but most are started as working animals much younger, though care must be taken not to over-stress the "soft" bones of younger animals. Yearlings are generally too young to be ridden at all, though many race horses are put under saddle as yearlings, usually in autumn. Physiologically young horses are still not truly mature as two-year olds, though some breeds do start young horses in a cart or under saddle at that age. The most common age for young horses to begin training under saddle is the age of three. A few breeds and disciplines wait until the animal is four.
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