Synonyms

No known synonym

Name of the disease in English

Hemeralopia-Day blindness

The disease in brief

Hemeralopia is a deficit of daytime vision associated with retinal degeneration, encountered in the Norman Race. It is progressive and manifests itself from the age of 5 years. It would be hereditary. 

Clinic & diagnosis

The absence of a threat blink reflex and of a pupillary reflex to light in Normandy cattle aged 5 years or more raises suspicion of the anomaly.

Typical sign of the disease

No description

Pictures

See below

Diagnostic formulas 

No description

Differential diagnosis

-Blindness is not common in cattle; it is due to the consequences of eye infections, Vitamin A deficiency, central nervous disorders (Listeriosis, necrosis of the cortex, etc.), poisoning (Lead, Closantel).

-Vitamin A deficiency NV21

-chlorinated naphthalene poisoning (N183)

Confirm a suspicion?

No specific test.

Prognosis and treatment

No treatment.

Prevention

Do not keep offspring of cattle affected by the anomaly.

References

No description