Diseases of cattle, sheep, goats Diseases of cattle, sheep, goats and swine diseasesofcattle00mous Year: 1920 Fig. 198.—Larva of the grass tick. Length, jth of 1 mch. Fig. 199.—Pupa of the grass tick. Length, TRh of 1 inch. a peculiar feature about them is that some may be very bad for loujing- ill one year, and others bad another year. Of two adjoining farms, one may be badly attacked and the other mildly, while in the following year the conditions may be reversed. Districts may present the same pecu- liarities. Thus, though the disease is essentially endemic, it is not abso- lutely cons
Diseases of cattle, sheep, goats Diseases of cattle, sheep, goats and swine diseasesofcattle00mous Year: 1920 Fig. 198.—Larva of the grass tick. Length, jth of 1 mch. Fig. 199.—Pupa of the grass tick. Length, TRh of 1 inch. a peculiar feature about them is that some may be very bad for loujing- ill one year, and others bad another year. Of two adjoining farms, one may be badly attacked and the other mildly, while in the following year the conditions may be reversed. Districts may present the same pecu- liarities. Thus, though the disease is essentially endemic, it is not abso- lutely constant in its recurrence. There seem to be certain circumstances capable of favouring or retarding it. Lesions. The chief lesions are localised in the membranes of the brain and spinal cord, which are congested or inflamed, and contain an increased amount of cerebro-spinal fluid or a jelly-like, sometimes blood- stained exudation. Softening and hardening of the spinal cord have both been observed. Inflammation of the pleura and pericardium, with fluid or jelly-like exudation, are common; lobar congestion of the lungs, endo- carditis, gastritis, and enteritis have all been described; some observers have mentioned congestion of the kidneys and liver and swelling of the spleen. Lesions of the nerve-centres are the most constant and reliable.
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