. Veterinary studies for agricultural students. Veterinary medicine. LECTUEE XXVII MANGE Horse Mange Causes.—Mange of horses, cattle, hogs and many other ani- mals is similar in cause, symptoms, and spread to sheep scab. Horses, like sheep, are subject to three forms of the disease. The most common form in the horse is due to the Sarcoptes, which burrows and affects the head, neck, and body. Another form is due to Psoroptes which moves freely and affects the surface. A third form is due to the Chorioptes, which lives on the surface, moves but little, and affects feet and legs, usually below th
. Veterinary studies for agricultural students. Veterinary medicine. LECTUEE XXVII MANGE Horse Mange Causes.—Mange of horses, cattle, hogs and many other ani- mals is similar in cause, symptoms, and spread to sheep scab. Horses, like sheep, are subject to three forms of the disease. The most common form in the horse is due to the Sarcoptes, which burrows and affects the head, neck, and body. Another form is due to Psoroptes which moves freely and affects the surface. A third form is due to the Chorioptes, which lives on the surface, moves but little, and affects feet and legs, usually below the knees and hocks. Sarcoptes scabei var. equi is a common cause of horse mange. This is one of the smaller mites, practi- cally invisible to the unaided eye. These mites burrow tunnels into and under the skin. The eggs are laid and the young are hatched in these tunnels. On account of this tunneling habit, spread is slow at first and the disease difficult to cure in advanced cases. Spread of mange mites may be direct from horse to horse or indirect by way of the harness, saddle, blanket, currycomb, or a post, for example. Symptoms.—The disease usually appears first on the head or side of the neck, and the first symptoms are small pimples and itching. The skin loses hair, becoming thickened, roughened, and wrinkled. Affected horses are much more uneasy at night, particularly in a warm stable. Treatment.—It is usually necessary to repeat treatment at least once, and in bad cases, several times at intervals of ten 137. Fig. 46.—Mange Mite. The cause of one form of horse mange. Psoroptes com- munis Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Reynolds, Myron Herbert, 1865-. New York, The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectveterin, bookyear1922
