There are probably as many opinions as there are veterinarians in what constitutes an appropriate set of diagnostic procedures and therapeutic options for a subfertile or problem mare.

Horse breeding is the procedure by which an adequate number of sperm are deposited into the uterus of a "healthy" mare at the right time.

The mare under the influence of estrogen will have an increase of edema of the reproductive tract.

The significance of venereally transmitted disease in horses is gaining importance since the number of mares being bred by a single stallion has increased significantly.

The use of ovulatory inducing agents is a key tool in the breeding management of mares.

The minimum insemination dose of 500 million progressively motile spermatozoa for fresh semen and double that for cooled semen, established by Colorado workers in the mid 70s has been widely accepted as the industry standard.