Neurological signs (sudden blindness) in Simmental bulls
- Cases of sudden-onset blindness were investigated in three one-year-old bulls in the South West.
- One bull died but two responded to treatments of thiamine and vitamin A.
- A range of tissue samples from the dead animal were submitted for laboratory testing.
- Microscopic examination of the brain showed severe polioencephalomalacia, most commonly caused by thiamine (vitamin B1) deficiency.
- Read more on thiamine deficiency induced polioencephomalacia (PEM) of cattle and sheep.