Observations on the placentae of eight Thoroughbred foals born with flexural limb deformities


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Congenital flexural deformities are relatively common in newborn Thoroughbred foals. This paper reports on the physical and morphological examination of 8 placentae from foals with varying degrees of the condition. All the placentae showed one or more of the following characteristics: a reduction in their linear dimensions; folding of the allantochorion over the course of major blood vessels; oedema. Although the changes observed in the placentae were indicative of uterine narrowing, it remains unclear if they are the cause of, an effect of or unrelated to the deformities.