Rectal palpation of the follicles is the best method of assuring the semen is introduced at the correct time. As the follicle begins to expand, it should be monitored regularly, as often as once every 12 hours. As ovulation nears, the shape of the follicle changes from spherical to more teardrop. It is necessary for the semen to be introduced within 12 hours of ovulation or its chances of success are nil. Natural Cover - The stallion covers the mare.
Natural cover is the good old fashion way.
It is the only method you can use with thoroughbreds that you want to register a thoroughbred with the Jockey Club. There are no dangers of affecting the motility of the semen in handling as there are in other methods. More semen is normally introduced into the ovaries. Artificial Insemination - A veterinarian places the semen into the mare. The method you use depends upon what is available.