The Animal Parasites of Sheep

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U.S. Government Printing Office, 1890 - 222 páginas
 

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Página 195 - Fig. 7) will be sufficient, and the trocar may be dispensed with. When the needle has entered the trachea, a slight hissing noi.se due to the- entrance and exit of air with each inspiration and expiration indicates that the needle has reached its destination and is not plugged. The substances to be injected should have distinctly vermicide properties without being at the same time too irritating or poisonous in their effects on the animal. Levi gives two formula1 which lie used with success upon...
Página 194 - ... and absorbed. Finally, there is always a slight reduction in the number of respirations, amounting to about three or four per minute, after the introduction of liquids, even when distilled water only is injected. Without entering into interesting questions concerning the administration of medicines in this manner in other diseases which are discussed at length in the work mentioned, we find that the author has experimented on but one case of lung- worms to test the efficacy of the method. Others,...
Página 183 - Bihar, pisolitic concretions of hydrated iron peroxide, from the size of a mustard seed to that of a pea, are disseminated through the clay ; occasionally these nodules attain larger dimensions, some being found, near Dinajpur of the size of pigeons
Página 194 - ... the trachea, which will be felt as a tense elastic tube along the middle line of the neck. The most convenient point for the introduction of the needle is at about the middle of the length of the neck. It must be remembered that some care is to be observed, as the trachea is in relation with some important structures on either side, the jugular vein, the carotid artery, and the pneumogastric nerve. Having fixed the trachea with the left hand, the needle with the trocar is inserted beneath the...
Página 96 - The majority may die during cold storms, either from freezing or from suffocation while piling upon each other for warmth. They may starve to death either from Inability or lack of desire to eat. They may die from other diseases. The tapeworm disease appears to render them more liable to other affections and less able to withstand the inclement season. It is therefore indirectly chargeable with the loss.
Página 194 - ... space is sought so as not to pierce a cartilaginous ring. Or the needle may be pushed directly into the trachea without necessarily avoiding a cartilaginous ring. The unimpeded movement of the free end of the needle as if in an empty space is a sure sign that the needle is in its proper place. The trocar is now removed, the syringe screwed upon the needle and the contents very slowly forced out into the trachea, Before the needle is finally withdrawn, Dr. Levi thinks best to wash it out with...
Página 194 - The needle of the syringe must be provided with a removable solid rod or trocar, so as not to become plugged when it is pushed through the skin and walls of the trachea. As the needles are apt to break, a number of them should be kept on hand. After the operation the syringe should be carefully washed in pure water, the piston supplied with a drop of olive oil, and the trocar replaced in the needle. It is best TO disinfect by filling the syringe and needle with a 5 per cent, solution of carbolic...
Página 25 - On the under side it is of the same color, but not variegated in the same way, there being a dark spot in the middle of each ring. The feet are brown, the under side of the head is puffed out and white. The antennae are extremely small and spring from two lobes which are sunk into a cavity at the anterior and under part of the head. The eyes are purplish brown, and three small eyelets are distinctly visible on the top of the head. It has no mouth and can not, therefore, take any nourishment.
Página 41 - Curtice who studied the parasites of the sheep most thoroughly, writes: "to feed them they were placed upon the back of my hand. By this means I could, with a lens, watch them bore into the skin and see the abdomen slowly enlarge as they drew in the blood. They had some difficulty in penetrating the thick skin, but usually succeeded by slipping their tube into a hair follicle. At first no itching or irritation was felt, except a slight twinge when the bills first penetrated the skin; but little swellings...
Página 55 - From the summit of each elevation or papule, a watery, serous fluid exudes aud accumulates, which transforms them into vesicles and pustules, and which in drying cover them over with a thin crust. In a few days the whole surface is covered with a yellowish, greasy, scaly layer, under which the parasites are hidden. As the disease proceeds this layer gradually increases in thickness by an increase of the serous...

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