. Diseases of cattle, sheep, goats and swine. Veterinary medicine. DISTOMATOSIS—LIVER FLUKE DISEASE—LIVER ROT. 301 enormous number (37,000 to 45,000) of eggs. This unusual fertility of the parasite is necessary because of the complicated life history and the com- paratively small chance any one egg has of completing the entire cycle. Hosts. An interesting and, from an agricultural standpoint, an important matter connected with this fluke is that it is found in a large number (about twenty-five) of domesticated and wild animals, and this. Fig. 157.—Drawing from a microscopic preparation, showin
. Diseases of cattle, sheep, goats and swine. Veterinary medicine. DISTOMATOSIS—LIVER FLUKE DISEASE—LIVER ROT. 301 enormous number (37,000 to 45,000) of eggs. This unusual fertility of the parasite is necessary because of the complicated life history and the com- paratively small chance any one egg has of completing the entire cycle. Hosts. An interesting and, from an agricultural standpoint, an important matter connected with this fluke is that it is found in a large number (about twenty-five) of domesticated and wild animals, and this. Fig. 157.—Drawing from a microscopic preparation, showing the glandular hyper- plasia of the mucosa of a gall-duct caused by the common liver fluke {Fasciola hepatica). a, Hypertrophied submucosa ; b, interstitial connective tissue; c, com- pressed lobule ; d, lumen of the gall-duct—thickened fibrous wall of the gall-duct. (After Schaper, 1890, PI. I., Fig. 2.) fact probably explains to some degree the wide geographical distribution of the parasite. Symptoms. The symptomatology of this disease may clinically be divided into three well-marked periods: I. Primary period. The primary phase commences with the pene- tration of the embryos of the parasite into the body, firstly into the intestine, and then into the liver by ascending the bile ducts. This phase occurs during the last months of the year, October, November, and December, and is rarely accompanied by alarming symptoms. At this time the sheep appear in good health, the summer being over, and 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 perfectly resemble the original Moussu, Gustave, 1864-; Dollar, Jno. A. W. (John A. W. ). Chicago : American Veterinary Pub. Co.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectveterin, bookyear1920
