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Management of Abortion
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Abortion is a significant cause of Thoroughbred wastage. Analysis of Weatherbys’ Annual Returns for Mares for 2006 shows that the percentage of UK and Irish Thoroughbred mares recorded as suffering abortions (pregnancies aborted after 5 months) was 2.4%. In 1977 the same figure was 3.3%. Rates of abortion have therefore improved during the last two decades. The data is skewed through the 1990s by the introduction and increasing use of ultrasound scanning, which made the accurate diagnosis of early pregnancy possible. Data from the same source shows that the number of Thoroughbred mares mated have increased (14,556 in 1977, 23,415 in 2006) and that conception (77.5% in 1977, 97.1% in 2006) and live foal (68.1% in 1977, 88.8% in 2006) rates have risen steadily, during these 29 years.
Surveys of the causes of abortions, stillbirths and neonatal losses have been published over the years, from different parts of the world. Both infectious and non-infectious causes may be involved. The foetal and placental products of equine early pregnancy failures are seldom available for investigation. This discussion therefore concentrates on abortions as seen and investigated in equine practice and does not include stillbirths, i.e. full-term foals that die during or immediately after birth or neonatal losses.
Prevention of further abortions
When a mare aborts she should be isolated in the stable or in the paddock in which she aborted. Other mares in the same paddock should be moved to a clean paddock and kept in batch isolation at least until the cause of the abortion is established. It is important that it is clearly understood that although a group of mares may have been together throughout their pregnancy, individual mares are not infectious for Equine Herpesvirus (EHV) until abortion occurs, so it is essential that the aborted mare should be immediately isolated from the rest of the group and all other pregnant mares. [...]
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