^570 



DISEASES OF THE SKIN. 



base of the horns and the root of the tail ; thence it spreads to the 

 back, costal walls, etc. ; it may invade the entire body. 



Its principal manifestations are more or less numerous pimples, 

 €xudation, an abundant epidermic desquamation, falling out of the 

 hair, an intense pruritus and the formation of dry, gray-brownish 

 -scabs. In the course of time the skin becomes thickened, stiff, 

 acquires the consistence of leather and becomes wrinkled. During 

 extreme seasons Muller has observed alterations of aggravation 

 (winter) and improvement (summer). When the disease spreads 

 over the whole surface of the body, the animals lose flesh and may 

 die. It coexists sometimes with symbiotic mange (Miiller). Roll 

 has found it on the buffalo. 



The treatment is the same as for other animals ; creosote and 

 'tobacco decoctions have proved particularly efficient. 



2. Symbiotic mange. This is also known under the name of 

 'tail mange. It remains generally localized upon the depressions of 

 the posterior part of the pelvis and on the base of the caudal ap- 

 pendage ; it may, however, extend over the whole surface of the 

 body (back, neck, internal aspect of the thighs) when the hygiene 

 •of the skin is neglected. These cases are rare ; those in which 

 mange is propagated to the members (foot mange) are also excep- 

 tional. The evidence of symbiotes in malt or residue eczema is 

 without importance (Johne), notwithstanding that Rabe has at- 

 tempted to assimilate this trouble to foot mange. These morbid 

 conditions may coexist, but they are radically different. Malt 

 «czema may favor the extension of symbiotic mange. 



If characterized by abundant desquamation or a formation of 

 scabs, by partial depilations and itching,, this mange may persist 

 for years without any discomfort to the animals; its spreading ten- 

 dency is almost wanting, and its contagiousness hardly noticeable. 

 We are rarely called on to treat it. The mild anti-psorics indi- 

 cated for the horse (carbolated soap, tar ointment) suffice in every 

 instance. 



3. Saecoptic mange. This acariasis is extremely rare in the 

 ox, which is always contaminated through the horse. It is there- 

 fore entirely accidental, and not important ; it is sufficient to men- 

 tion it. Besides, its symptoms are the same as in the horse. 



