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Within a few hours after birth, the larvae develop into pupae, which are hard, dark brown in color and firmly glued to the wool. The young louse-fly emerges from the pupa in from three to four weeks. The sheep-tick is a very common external parasite. The adult parasites and the pupae are large and easily found. When badly infested with ticks, a sheep will rub, dig and scratch the skin and fleece.
Give the life history of the bot-fly of the horse; of the ox; of sheep. Give the symptoms of bot-fly diseases. Give the symptoms of lousiness. Give treatment for lousiness of different farm animals. What is the damage from the sheep-tick? Give treatment. Describe the injury from scabies and mange. Give treatments for these diseases. Mention the several poultry mites and tell how to treat them.
THE SHEEP-TICK. This is not a true tick. Louse-fly is a better name for this parasite than tick, as its entire life is spent on the body of a sheep. The general color of the body is brown. The legs are stout, covered with hair and armed with hooks at their extremities. The mouth parts consist of a tubular, toothed proboscis with which the parasite punctures the skin and sucks the blood.
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