Oviduct blockage

In practice a small number of mares are encountered which appear to be unable to conceive when inseminated, naturally or artificially, with semen from stallions of proven fertility. These mares are often middle-aged/old and their poor breeding record may persist in the absence of any identifiable abnormality of their reproductive tract and with intensive veterinary management. The potential for compromised oviduct function has been proposed as a contributory factor. Evaluation of the oviduct and recognition of abnormalities which may compromise function is challenging. The small size and location of the organ prevent examination by normal diagnostic procedures. The only part of the oviduct that can be visualised is the uterotubule junction (UTJ) during hysteroscopy ...