. Common diseases of farm animals. Veterinary medicine. GENERAL DISCUSSION OF DISEASE 5 The predisposing causes are such factors as tend to render the body more susceptible to disease or favor the presence of the exciting cause. For example, an animal that is narrow chested and lacking in the development of the vital organs lodged in the thoracic cavitv, when exposed to the same condition as the other members of the herd, may contract disease while the animals having better conformation do not (Fig. 1). Hogs confined in well-drained yards and pastures that are free from filth, and fed in pens
. Common diseases of farm animals. Veterinary medicine. GENERAL DISCUSSION OF DISEASE 5 The predisposing causes are such factors as tend to render the body more susceptible to disease or favor the presence of the exciting cause. For example, an animal that is narrow chested and lacking in the development of the vital organs lodged in the thoracic cavitv, when exposed to the same condition as the other members of the herd, may contract disease while the animals having better conformation do not (Fig. 1). Hogs confined in well-drained yards and pastures that are free from filth, and fed in pens and on feeding floors that arc clean, do. Fig. 1.—(A) side and (B) posterior view of bull showing conformation favorable to the development of disease. not become hosts for large numbers of parasites. Hogs confined in filthy pens are frequently so badly infested with lice and intes- tinal worms that their health and thriftiness are seriously inter- fered with. In the first case mentioned the predisposition to disease is in the individual, and in the second case it is in the surroundings (Fig. 2). The exciting causes are the immediate causes of the par- ticular disease. Exciting causes usually operate through the environment. With the exception of the special disease-produc- ing germs, the most common exciting causes are faulty food and. 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 Craig, Robert Alexander, 1872-. Philadelphia London, J. B. Lippincott company
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Keywords: ., bookpublisherphilad, booksubjectveterinarymedicine, bookyear1919
