Diseases of cattle, sheep, goats Diseases of cattle, sheep, goats and swine diseasesofcattle00mous Year: 1920 CCENUROSIS (GID, STURDY, TURN-SICK). 471 eye appear infected, but examination with the ophthahiioscope reveals lesions of more or less extensive neuro-retinitis. The visual disturbance is of central origin. The powers of move- ment may be affected in numerous ways, which at times are extremely difficult to estimate with accuracy. Sometimes the gait is uncertain, inco-ordinated, and hesitant; at others the animal shows lameness or loss of control over a front or hind limb, or over two
Diseases of cattle, sheep, goats Diseases of cattle, sheep, goats and swine diseasesofcattle00mous Year: 1920 CCENUROSIS (GID, STURDY, TURN-SICK). 471 eye appear infected, but examination with the ophthahiioscope reveals lesions of more or less extensive neuro-retinitis. The visual disturbance is of central origin. The powers of move- ment may be affected in numerous ways, which at times are extremely difficult to estimate with accuracy. Sometimes the gait is uncertain, inco-ordinated, and hesitant; at others the animal shows lameness or loss of control over a front or hind limb, or over two limbs simul- taneously (either the two front or hind limbs or the diagonal limbs), or it may be absolutely unable to stand. It walks obliquely, or the front or hind limbs collapse; or again, it may persistently lie down, a fact which makes the shepherd think it is suffering from paralysis. On examination, however, no true indications of paralysis can be found; sensation and motor power are both pre- served in a modified form. Death is very frequent at this stage of the disease; the animals eat little or nothing, re- fuse drink, and die of ex- haustion. All this general distur- bance is of central origin, and is due to disseminated parasitic encephalitis, but up to this point the seat of a lamb infested with young of the disease is not yet gidU-Addevworms{Ccenumscerebralis). Natural clearly apparent. size. (After Leuckart.) Second phase.—Tani- skk.—-The central symptoms are slow of development, and are due to the progressive growth of one or two, more rarely three or four, fer- tile vesicles. These are the true symptoms of turn-sick, and it is only after this phase of the disease has developed that the term becomes appropriate. Left at liberty, the patient usually walks in a circle towards the right or left in an impulsive and irresponsible fashion. Sometimes it describes a circle, always of the same size. In other cases, on the contrary, it travels along a spir
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