. Diseases of cattle, sheep, goats and swine. Veterinary medicine. SCABIES IN SHEEP. 611 All these solutions, however, are more or less poisonous and need to be used with caution, weak solutions only being used at first, par- -^is.^ ''i'M|;'i">,„> i.'.II'Vj H. cz 5' Fig. 249.—Adult sheep tick {IVMophagus ovinus). (a) Tick ; (6) puparium. Magni- fied. (Salmon and Stiles, Annual Report, Dept. of Agriculture, 1897, p. 103.) —TWc/w- dectes scalaris of the ox. Mag- nified 20 dia- meters. (After Kailliet.) ticularly in the case of animals, such as oxen, which are give
. Diseases of cattle, sheep, goats and swine. Veterinary medicine. SCABIES IN SHEEP. 611 All these solutions, however, are more or less poisonous and need to be used with caution, weak solutions only being used at first, par- -^is.^ ''i'M|;'i">,„> i.'.II'Vj H. cz 5' Fig. 249.—Adult sheep tick {IVMophagus ovinus). (a) Tick ; (6) puparium. Magni- fied. (Salmon and Stiles, Annual Report, Dept. of Agriculture, 1897, p. 103.) —TWc/w- dectes scalaris of the ox. Mag- nified 20 dia- meters. (After Kailliet.) ticularly in the case of animals, such as oxen, which are given to licking themselves. SCABIES—SCAB—MANGE. The term scabies is given to a group of diseases affecting man and all domestic animals. These diseases are produced by two classes of parasites, viz., sarcoptinse, which live within the epidermis or on the surface of the skin, and demodectes {sing, demodex), which penetrate into the sebaceous glands and hair follicles. Scabies, though known from the earliest times, has long been con- founded with constitutional diseases characterised by cutaneous erup- tions. The symptoms shown were formerly regarded as due to the elimination of "humours" which the organism was casting off, for which reason scabies was even treated with internal medicines. At the present time the cause of the disease is perfectly well under- stood, as well as the mode of development of the different parasites. The rate at which these parasites develop is almost incredible, a fact which explains the highly contagious character of the disease. Each species of animal may present several varieties of scabies, caused by different parasites, such as sarcoptes, psoroptes, chorioptes, demodectes, etc. SCABIES IN SHEEP. Scabies in sheep usually assumes one of three forms—sarcoptic, psoroptic, or chorioptic scabies. Follicular, or demodectic, mange affects E R 2. Please note that these images are extracted from scanned page images that may have been digi
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