Breeding horses can be done through live coverage, where a stallion and mare are introduced to each other, or by artificial insemination done at the veterinarian's office. Choose a method of breeding with advice from a professional horse trainer in this free video on horse care.
If you don't have a stallion around, you can take her to a veterinarian and he can palpate her, and palpating her, he'll put on a glove and he'll go through the rectum and he'll feel for the eggs. Now the ovaries in a horse sit right about here and he'll be able to go in and feel the ovaries and the birth canal and feel if there's been an egg that she's ready to breed. And once she's ready to breed, then you can introduce her to the stallion and have live coverage or you can AI which is artificial insemination. And either way works really great, big barns like to do the AI 'cause then it doesn't expose their stallion as much to being injured by the mare because they will kick and they will scream and carry on just like horses do.