. Diseases of poultry; their etiology, diagnosis, treatment, and prevention. Poultry. Diseases of the Liver 95 to this disease. In certain portions of this country where once turkey raising was a promising industry it has practi- cally vanished because of this disease. The disease is not usually as fatal to adult chickens but may cause very serious losses at times. It is believed by several prominent investi- gators of this disease that white diarrhea, so destructive to young chicks, is caused by the same organism as blackhead. (For further discussion of this see Chapter XVIII.) The cause of b
. Diseases of poultry; their etiology, diagnosis, treatment, and prevention. Poultry. Diseases of the Liver 95 to this disease. In certain portions of this country where once turkey raising was a promising industry it has practi- cally vanished because of this disease. The disease is not usually as fatal to adult chickens but may cause very serious losses at times. It is believed by several prominent investi- gators of this disease that white diarrhea, so destructive to young chicks, is caused by the same organism as blackhead. (For further discussion of this see Chapter XVIII.) The cause of blackhead disease according to Theobald Smith ^ is a minute par- asitic protozoon known as Amoeba mele a g r idis. These appear as minute round bodies not more than 10 microns (I'sW inch) in diameter em- bedded in the submucous and intramuscular tissue of the wall of the ceca and may extend even be- yond these to the mesen- teries. In the liver there are circular spots (Fig. 9) representing partial necrosis of the liver tissue and in these spots the same or- ganisms are also present in great numbers. The analogy between this organism and that concerned in human amoe- biasis is very close. More recently Cole and Hadley ^ at the Rhode Island. Fig. 9. — Showing condition of liver in "; (Modified after Moore.) 1 Smith, Theobald., "An Infectious Disease among Turkeys Caused by Protozoa (Infectious enterohepatitis)." U. S. Dept. of Agr., Bur. Anim. Ind., Bui. 8. pp. 7-38, 1895. - Cole, L. J., and Hadley, P. B., "Blackhead in ; Rhode Island Expt. Stat. Bui. No. 141, pp. 138-272, 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, 1879-1940; Surface, Frank M. (Frank Macy), 1882- joint author; Curtis, Maynie R. (Maynie Rose), b. 1880, joint author. N
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectpoultry, bookyear1915
