Not only should the pertinent parts of both animals be thoroughly washed before coming in contact with each other, but the wash-rack facilities should be built so as to be easily disinfected and scrubbed. If you need to breed your mares early in the year, you may have to resort to artificial methods to induce estrus. As with anything electrical in a barn, make sure that cords and wires are well out of the horses' reach. Foaling stalls should be located towards the center of the barn, near to the office or a place where the foaling mare can be observed unobtrusively by the farm staff. Hygiene is crucial in a foaling stall, so it should be constructed of materials that make it easy to clean and disinfect.
Many farms install quartz-halogen radiant heat lamps in the ceiling of their foaling stalls.
Stallions, too, have special housing needs. A stallion is usually a bigger animal, as well as a little more rambunctious, so he needs a little more room to move around. The type of breeding you are doing will dictate the other facilities your barn will need. You may want to install a set of breeding stocks on the property. Any farm which is dealing with cooled or frozen semen will want to have a lab immediately accessible to the breeding shed as well.