. Swine practice . Swine. DIGESTIVE SYSTEM 139 Icterus, associated with digestive derangement, will probably be the only evidence of the presence of this parasite in any portion of the liver or its excretory duct. The location of the parasite prohibits the successful use of therapeutic agents. The possibility of invasion into any of the hepatic structures may be diminished by frequent medication of the swine with agents previously mentioned that will eliminate these parasites from the bowel. Frequent cleaning, and removal of the excrement from the pens, yards, or barns, will tend to diminish i
. Swine practice . Swine. DIGESTIVE SYSTEM 139 Icterus, associated with digestive derangement, will probably be the only evidence of the presence of this parasite in any portion of the liver or its excretory duct. The location of the parasite prohibits the successful use of therapeutic agents. The possibility of invasion into any of the hepatic structures may be diminished by frequent medication of the swine with agents previously mentioned that will eliminate these parasites from the bowel. Frequent cleaning, and removal of the excrement from the pens, yards, or barns, will tend to diminish in- festation. â - Distomatosis '' < This is a condition resulting from the invasion of the liver by the Distoma hepaticum, Distoma Americanum, or Distoma lanceolatum. All are commonly called flukes. Distomatosis occurs most frequent- ly in animals kept upon low, marshy, or swampy lands. Swine raised in the southern part of the United States are commonly infested. The exact life cycle of these parasites has been carefully worked out and may be obtained by reference to works on para- sites; suffice here to say that the ova are eliminated from the liver in the bile and pass to the outside in the fecal matter. After several changes the embryos are found upon vegetation which is consumed by their hosts. They find their way up the hepatic duct and on into the bile tubes within the liver. Lesions.âThe lesions established by the different types of Distoma are slightly different. The Dis- toma hepaticum remains for six months in the bile tubes in the liver where it produces obstruction of bile and inflammation of the bile tubes. The ac- cumiilated bile causes distention of the bile tube, which is usually very evident, particularly upom the posterior surface of the liver. The dilated bile fr^^Swr^ tube is found to be thickened and contains thick- Fig. 28. Distoma ened flocculent bile and flukes in some stage of a Inte^stines'"' development, depending upon the length of time b.'
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectswine, bookyear1921
