Congenital hypotrichosis in a Percheron draught horse.

The study discusses a case of a Percheron horse affected by congenital hypotrichosis, characterized by patchy fur loss since birth that became almost complete by the age of one. Despite the condition, the horse’s overall health and growth remained normal with minor variations.

Horse Characteristics and Observations

• A blue roan Percheron foal, a breed of draught horse, was noticed to have patchy alopecia starting from its trunk and legs.
• The condition worsened over time, with the horse losing almost all its hair by the time it turned one.
• In all other aspects, such as the development of teeth and hooves, the horse was normal.
• The horse’s size is somewhat smaller than average for its breed but is otherwise healthy and has lived to six years of age.

Scientific Examination and Findings

• A skin biopsy was carried out when the horse was seven months old.
• Upon examination of the biopsy sample, it was revealed that the horse suffered from severe follicular hypoplasia, a condition responsible for reducing the development of hair follicles.
• The sebaceous glands, responsible for producing the oily substance sebum, were found to be functioning normally. Similarly, the sweat glands and arrector pilae muscles, responsible for causing hair follicles to stand erect during the phenomenon of ‘goosebumps’, were also normal.

Diagnosis

• The symptoms and the results from the histopathological examination led to the diagnosis of congenital hypotrichosis, a genetic disorder that leads to hair loss or the inability to grow hair.
• It’s a condition present at birth and is believed to be caused by a mutation in a gene responsible for hair growth.