. Swine practice . Swine. INFECTIOUS DISEASES 333 milk become infected even though the mammary gland contain no tuberculous lesions. From the foregoing it is evident that any of the discharges of tuber- culous animals may contain the tubercle bacilli. In the United States and in practically all other countries tuberculosis of cattle is prevalent, particularly among cattle used for dairy purposes. The most frequent source of porcine tuberculosis is from tubercu- lous cattle. Swine become infected from the infected cow's milk, feces, nasal discharges, and the carcasses of tuberculous cattle that
. Swine practice . Swine. INFECTIOUS DISEASES 333 milk become infected even though the mammary gland contain no tuberculous lesions. From the foregoing it is evident that any of the discharges of tuber- culous animals may contain the tubercle bacilli. In the United States and in practically all other countries tuberculosis of cattle is prevalent, particularly among cattle used for dairy purposes. The most frequent source of porcine tuberculosis is from tubercu- lous cattle. Swine become infected from the infected cow's milk, feces, nasal discharges, and the carcasses of tuberculous cattle that are given them for food. A limited number of swine become infected from garbag-e that contains the human tubercle bacilli. This has been especially observed in swine fed upon garbag'e from tuberculosis san- itaria, or hotels. An occasional case of uterine, ovarian, or testicular tuberculosis is the result of direct infection by copulation. It is pos-. Fig. 97. TUBERCULOSIS OP THE TONGUE. A, normal muscle; B, tuberculous lesions; this is a rare condition in swine. sible that infection may be transmitted in the exhaled air from in- fected to healthy swine. Channels of entrance.—The most frequent channel of entrance of the tubercle bacilli in swine is the digestive tube, the infection being introduced in food or water. An occasional case may become infected by the inhalation of the bacilli and by direct transmission through the genital organs. Mammary tuberculosis may be the result of cutaneous infection or it may be transmitted from elsewhere in the body. The transmission of the tubercle bacilli from the mother to the fetus is possible, but it is of rare occurrence. But a weakened con- dition or susceptibility to the disease may and frequently is trans mitted from the mother to the 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 perfectl
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectswine, bookyear1921
