. Special report on diseases of cattle . Cattle. 512 DISEASES OF CATTLE. Fig. 21.—The common liver fluke (Fasciola hepatica). considerable. The greenish or yellowish nodules with cheesy con- tents are frequently mistaken by the inexperienced for lesions of tuberculosis. The life histories of the various small roundworms occurring in the intestines of cattle have not been worked out, but in general they are very likely similar to that of the twisted stomach worm as described above (p. 506). Treatment for intestinal roundworms.—The preventive measures are similar to those recommended in the case
. Special report on diseases of cattle . Cattle. 512 DISEASES OF CATTLE. Fig. 21.—The common liver fluke (Fasciola hepatica). considerable. The greenish or yellowish nodules with cheesy con- tents are frequently mistaken by the inexperienced for lesions of tuberculosis. The life histories of the various small roundworms occurring in the intestines of cattle have not been worked out, but in general they are very likely similar to that of the twisted stomach worm as described above (p. 506). Treatment for intestinal roundworms.—The preventive measures are similar to those recommended in the case of the twisted stomach worm (p. 507). Medicinal treatment is generally not very satisfactory. Powdered thymol, in doses of 200 grains or more, has been recommended, but it often fails to have the desired result. It is claimed by one author that 2 to 3 drams of rectified empyreumatic oil in a mucilaginous emulsion, followed the next morn- ing with a purgative of 1 to 1£ pounds of sulphate of soda, will expel the large roundworms (Ascaris vitulorum). Protozoa. A number of species of prutozoa have been reported as parasites of the intestines of cattle. To one species has been attributed a serious disease of cattle in Switzerland known as red dysen- tery, but as yet no cases of this disease in American cattle have been reported. FLUKES IN LIVER AND LUNGS. Two species of flukes occurring in the liver and lungs are known to affect cattle of the United States. These parasites are flat leaf-like-worms; one of them, the common liver fluke (Fasciola hepatica, fig. 21), is less than an inch in length, while the other, the large American fluke (Fasciola magna, fig. 22), is considerably larger when full grown. In their life history these flukes depend on snails as intermediate hosts. At a certain stage of develop- ment the young flukes leave the snails, become en- cysted on stalks of grass (fig. 23), and finally may be swallowed by grazing cattle. Stiles states that "flukes may p
Size: 992px × 2519px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisherwashingtongovtprin
