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2014 AGM Speaker Dr. Marco deBruijn-The Prevalence, Cause, and Outcome of Dystocia (Birth Problems) in Friesian Mares; sponsored by the Fenway Foundation for Friesian Horses

THE PREVALENCE, CAUSE AND OUTCOME OF DYSTOCIA (birth problems) IN THE FRIESIAN MARE.

To study the prevalence, cause and outcome of birth problems (dystocia) in the Friesian mare, data from 66 referred dystocia cases in the period of 2001-2006 was retrieved from hospital files and questionnaires by telephone. The race distribution for caesarean section was as follows: 45 Friesians, 2 Warmbloods, 1 Standardbred, 2 Shetland ponies. For foetotomies- 9 Friesians, 1 Warmblood, 1 Shetland pony. For assisted vaginal delivery: 3 Friesians, 2 Warmbloods. The average race distribution of our hospital population is 35% Friesians, 33% Warmbloods, 20% Standardbreds, 1% Shetland ponies (11% others). 11/56(20%) Friesian dystocias were due to transverse intra-uterine positioning and 22/56(39%) due to ankylosis of the head and neck or the limbs. Former studies of dystocia cases in mixed hospital populations mention a prevalence of transverse presentation of 14/141(10%)1, 12/166(7%)2, 9/96(9%)3 and in a predominantly draft horse population 98/601(16%)6. The prevalence of dystocia due to ankylosis is reported as 10/150(7%)1 and 12/166(7%)2. 41/45(91%) Friesian mares that underwent caesarean section survived to time of hospital discharge. Similar survival rates are mentioned in literature: 89%2, 88%3. 19/45(42%) Friesian

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