Pregnancy rate is slightly better for non-shipped embryos (by a margin of approximately 5%). Most mares can be handled well at your location and the embryos shipped, provided you have a veterinarian with the expertise to handle the breeding, flushing and packaging for shipping. Some mares with breeding or fertility problems might be better handled here, but if you are breeding to a stallion whose semen does not ship well, it may be best for the mare to be near the stallion so fresh semen can be used. The decision of whether to bring your mare to EMS or to handle it at home may involve the occupation of the mare (for instance, whether you want to keep her in training or showing during this process), the availability of air transport (how quickly the embryo can be shipped), the expertise of your veterinarian and the availability of quality semen.