Cattle Scab and Its Control
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چکیده
IN HIS annual report for 1902, the Chief of the Bureau of Animal Industry referred to numerous inquiries about a disease commonly known as Texas itch. As the disease appears to have been more prevalent in other sections of the. country than in Texas, it seems strange that this name was applied to it At that time the disease was apparently fairly common among the range cattle of the West and Northwest, and it had also been heard of in other parts of the country. Investigation showed that the condition was scabies, a contagious skin disease commonly known as scab, mange, or itch, caused by insectlike parasites called mites. There are four species of the scabies parasite which affect cattle, and they belong to four different genera—Psoroptes^ Sarcoptes^ Ohorioptes^ and Demodex, The psoroptic mites, which cause common scab, live in groups or colonies on the surface of the skin, and the lesions, or damage to tissues they cause, spread in all directions from the spot first affected. The sarcoptic mites, which cause what is known in some regions as bam itch, bore into the skin, each female making a separate gallery in which she lays her eggs. The chorioptic mites live in groups on ih^ surface of the skin and usually remain localized on the legs or .tail with little or no tendency to spread. The demodectic mites are microscopic in size and are more like worms than typical mites; they live in the hair follicles and sebaceous (sweat and oil) glands and cause smooth spherical swellings, or pustules, in the skin.
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تاریخ انتشار 2010