264 DISEASES OF THE SKIN 



Symbiotic Mange in Sheep. — Symbiotic mange is very rare 

 in sheep and appears around the fetlocks and coronets, 

 usually of the hind feet. Besides an eczematous eruption 

 there is pruritus, causing restlessness and stamping. In 

 rare instances the scrotum or udder may be attacked. 

 Healing usually occurs spontaneously when the sheep are 

 turned out on grass. 



Cattle Mange. — In the ox the principal mange is the 

 psoroptic. The favorite seats are the lateral surfaces and 

 crest of the neck, base of the horns, withers and root of 

 the. tail. It rarely appears over the whole body. 



Symptoms. — The symptoms are those of pruritus and the 

 appearance on the skin of brownish-gray crusts and scabs, 

 the skin becoming thickened and welted. The hair falls out 

 over the infested regions. Excoriations of the skin may be 

 caused by the patient rubbing the part. If generalized the 

 patient becomes anemic, emaciated, cachectic and often dies 

 of inanition. The disease is worse in winter when the cattle 

 are stabled but improves in the spring when they are turned 

 out to graze. 



Treatment. — Treatment is the same as for horse mange, 

 avoiding, however, applications which contain mercury. 



Symbiotic Mange. This form occurs at the tail root, 

 on each side of the anus, and also on the legs. In rare in- 

 stances it may appear over the croup, loins, back, side of the 

 thigh and udder. It is characterized by pruritus, scabs, 

 squamae and loss of hair. It usually does not affect the 

 animal seriously but is worse during winter than in summer. 



Treatment.' — Treatment is the same as for psoroptic 

 mange. 



Mange of Swine. — In swine the only mange is the sarcoptic. 

 This is not a common skin disease in America. The favorite 

 seats are about the head (eyes, cheeks, ears) , although it may 

 extend from these parts to the neck, trunk, and limbs. 



Symptoms. — The symptoms are those of severe itching, 

 with which is associated a squamous eczema, the skin being 

 covered with bran-like scales which accumulate to form thick 

 crusts. If diffuse the skin surface assumes a peculiar silvered 

 appearance "as if strewn with guano." The underlying skin 



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