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Hydrallantois is a rare condition of the mare, where an excessive amount of fluid accumulates in the allantoic compartment. Normal volumes of allantoic fluid vary between 8 and 18 litres, with more than 25 litres being considered abnormal (Arthur 1969). Hydrallantois develops in the last trimester of gestation, usually in multiparous mares between the ages of 5 and 21, and is understood to occur due to placental pathology (Blanchard and others 1987). Clinical signs include acute abdominal distension, dyspnoea, inappetence, stiff gait and colic (Frazer 2010, Brinsko 2011, Govaere and others 2012). There appears to be no breed predilection (Blachard and others 1987, Govaere and others 2012). Drainage of the allantoic fluid and induction of parturition is the standard treatment, as continued abdominal enlargement increases the likelihood of prepubic tendon and uterine rupture (Brinsko 2011). Prognosis for foals is poor, as most are born dead or extremely weak, and despite intensive care, usually do not survive, or are euthanased (Frazer 2010, Govaere and others 2012). Prognosis for mares is good, provided appropriate supportive fluid therapy …
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