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Hoof wall separation disease
Hoof wall separation disease, (HWSD), is an autosomal recessive genetic hoof disease in horses.〔(UC Davis Veterinary medicine: ''Connemara Pony Hoof Wall Separation Disease'' ), accessed April 25, 2015〕 Research is being carried out at, among others, ''UC Davis School of Veterinary Medicine'' in Davis in California.〔(''Hoof Wall Separation Syndrome in Connemara Ponies'' ), Accessed November 4, 2014〕 The disease has been found in Connemara ponies and was earlier referred to as ''Hoof Wall Separation Syndrome'', HWSS.
==Symptoms==
The disease develops among foals from the age of one to six months and typically occurs during their first year of life. 〔(PLOS Genetics April 13 2015: ''SERPINB11 Frameshift Variant Associated with Novel Hoof Specific Phenotype in Connemara Ponies'' ), accessed April 25, 2015〕 The frontal edge of the hoof cracks and splits. Pieces of hoof wall chip off in bits. This cracking, chipping and peeling may involve the whole of the dorsal hoof wall. The deficit means that when the hoof wall reaches the ground (and weightbearing load) the wall breaks away from above the level of the sole. Thus the affected pony has to walk on the sole of the hoof with no support provided by the dorsal hoof wall. All four feet are similarly affected. This can be very painful for the animal, which may lead to the necessity of having the horse put down.〔 HWSD is often confused with white line disease (WLD) by those people who have no experience or knowledge of this genetic condition.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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