Horse training for racing is fascinating.
Yes it is, before they were trained for racing, they were trained for warfare. 
That is understandable, but a shame.    Beautiful animals.
Some horses are trained for specialized jobs for movies and circus entertainment. Not sure how great of a life for that kind of a horse is. 
True, but better than being shot!
Thats true, some of the cowboys that work for the circus probably were into ranch work and working with horses that way first. 
I like Stallions the best.
Yeah I think thats the kind they race because their seamen is worth a lot of money if they win. 
Horse breeding is a different story!
Horse breeding
Horse breeding is reproduction in horses, and particularly the human-directed process of selective breeding of animals, particularly purebred horses of a given breed. Planned matings can be used to produce specifically desired characteristics in domesticated horses. Furthermore, modern breeding management and technologies can increase the rate of conception, a healthy pregnancy, and successful foaling.
Terminology.
The male parent of a horse, a stallion, is commonly known as the "sire" and the female parent, the mare, is called the
Horse training
Horse training refers to a variety of practices that teach horses to perform certain behaviors when commanded to do so by humans. Horses are trained to be manageable by humans for everyday care as well as for equestrian activities from horse racing to therapeutic horseback riding for people with disabilities.
Historically, horses were trained for warfare, farm work, sport and transport. Today, most horse training is geared toward making horses useful for a variety of recreational and sporting equestrian pursuits. Horses are also trained for specialized jobs from