. The domestic sheep : its culture and general management. Sheep. 358 THE DOMESTIC SHEEP. Reoent exact knowledge now goes to help us greatly in strug- gling with this and all other parasites of our flocks, but the evil is so widespread and virulent, and there are so many who keep sheep who will not take the pains needed to exterminate all the pests of the flock, that it is hopeless to expect full deliv- erance from them. And the shepherd must still be watchful, ex- pert, and industrious, to avert the risks as far as may be possible. These parasites are external or internal, the former are few
. The domestic sheep : its culture and general management. Sheep. 358 THE DOMESTIC SHEEP. Reoent exact knowledge now goes to help us greatly in strug- gling with this and all other parasites of our flocks, but the evil is so widespread and virulent, and there are so many who keep sheep who will not take the pains needed to exterminate all the pests of the flock, that it is hopeless to expect full deliv- erance from them. And the shepherd must still be watchful, ex- pert, and industrious, to avert the risks as far as may be possible. These parasites are external or internal, the former are few in number, but the latter abound, and the variety of them is as- tounding to those who study the matter in its full bearings. Of the external enemies of this class which trouble the flock by far the worst are: THE SCAB MITE. These are insects of the family known as Acari, in which is included the common itch mite, which infests mankind. It also includes three species which affect sheep. These are known as the Sarcoptes scabici, which infests the head of the sheep; Psorop-. FiG. 27.—Scabby Sheep—Takep from Photograph. tes communis, which infests the body, and Chorioptes communis, which affects the feet. The life' history of these insects is similar in each rpecies. They attack the skin and bite it, and these wounds so made form scabs, under which the pests lay their eggs. Each female produces an average of ten young, which ma- ture in fifteen days, thus in the short season of three months. 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 Stewart, Henry. Chicago : American Sheep Breeder Press
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectsheep, bookyear1900
