. Diseases of poultry; their etiology, diagnosis, treatment, and prevention. Poultry. 322 Diseases of Poultry normally developed birds and that the growth of the tumor (Rous sarcoma) is slower in the underdeveloped birds. It is a well known fact in human pathology that physiolog- ical activity stimulates the growth of some tumors, while physiological decline stimulates others. This is undoubtedly true also of fowl tumors. Non-malignant tumors located on external parts may be. Fig. 72. — Cysto-adenoma on the serosa of the intestine. (After Picltens.) removed or they may be left alone. They will
. Diseases of poultry; their etiology, diagnosis, treatment, and prevention. Poultry. 322 Diseases of Poultry normally developed birds and that the growth of the tumor (Rous sarcoma) is slower in the underdeveloped birds. It is a well known fact in human pathology that physiolog- ical activity stimulates the growth of some tumors, while physiological decline stimulates others. This is undoubtedly true also of fowl tumors. Non-malignant tumors located on external parts may be. Fig. 72. — Cysto-adenoma on the serosa of the intestine. (After Picltens.) removed or they may be left alone. They will not ordinarily affect the health of the bird. Even malignant tumors are apparently not contagious. The ultimate nature of the causative agents has not been determined. With our present knowledge it is impossible to explain either the spontaneous origin of these agents within an individual or to account for their transfer from one Individ-. 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 Pearl, Raymond; Surface, Frank Macy, 1882- joint author; Curtis, Maynie Rose, 1880- joint author. New York, The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectpoultry, bookyear1915
